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== Political content on user page == == Userpage nominated for deletion ==


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Hi, I think a lot of the content on your user page is interesting, but it sits uneasily with the guidelines at ]. It strikes me that this material would be better posted on your personal blog (if you have one). There's probably no harm in keeping things as they are, but I'm curious about your motivations, I hope you don't mind me asking. Cheers, ] (]) 08:01, 9 July 2011 (UTC)
<div class="floatleft" style="margin-bottom:0">]</div> Hello, {{u|JRSpriggs}}. Your userpage was ''']''' a second time by {{u|Sundostund}}. I didn't see that a notification was placed on your talkpage about this, and several !voters in the MfD asked that you be contacted first regarding the contents of your talkpage before proceeding with the deletion discussion. The nominator believed your userpage violated ], ], ] and ]. I leave it to the two of you to determine if a middle ground can be reached on this, but I will say that although I had nominated your userpage for deletion in the past, I did not endorse the move to delete your page this time around. ''']'''-''<small>(])</small>'' 15:26, 9 November 2022 (UTC)


:Just for the record – if {{u|Sir Nicholas de Mimsy-Porpington}} wasn't listed as the original creator of JRSpriggs' userpage (by making back in 2007), then JRSpriggs would receive an automatic notification, by Twinkle, about the ongoing MfD nomination. As can be seen, the notification ]. — ] ] <sup>(] / ])</sup> 15:40, 9 November 2022 (UTC)
:I do not have a blog. In fact, I have only three active accounts on-line: (1) an e-mail account, (2) this account at Misplaced Pages, and (3) an account at youtube (just for watching videos, not posting them). So this is my only outlet for expressing my opinions. I cannot afford to pay for anything, so I only use these free accounts. And as a older person, I prefer not to get involved in the complexity of additional accounts, if I can avoid it.
:For a long time, I did not have a user page except as a redirect to this talk page. However, I finally decided to reveal some basic facts about myself without getting into information which could be used to steal my identity or embarrass me. Talking about my interests naturally led to describing my political views which are not mainstream. Especially, when we had the financial crisis, I felt compelled to say what I thought the cause was and possible cure might be. I guess you could say it evolved into a blog, but I do not change it very often and its length is not especially great. I do sometimes remove material which no longer reflects my view or has become irrelevant to current affairs. ] (]) 08:25, 9 July 2011 (UTC)
::Thanks for the explanation, this all makes good sense. Nowadays there are plenty of sites where one can start a blog without paying anything&mdash;but you're quite right, looking after multiple accounts can get complicated. ] (]) 10:26, 9 July 2011 (UTC)


::Allowing me 33 kilobytes to explain myself and my beliefs is a small price to pay for all my contributions to the encyclopedia's content and financial donations. ] (]) 03:33, 10 November 2022 (UTC)
:::I agree in part with ]. I don't care what you have on your talk page, but I'd be concerned that Misplaced Pages authors could delete my stuff at any time as per ]: user pages are not permitted to contain extensive personal opinion or soapboxing unrelated to the Misplaced Pages itself. You might look into ] which is free and easy to use (and you can include a lot on your user page there if you prefer having a home-base for opinion rather than a blog), or ] for a more interactive experience. ] is another common resource (but I'm less familiar with them personally). I hope it never becomes an issue for you, but I'd keep everything backed up either way, just to be safe. ] (]) 05:40, 1 September 2011 (UTC)
:::Hello JR! I have snow closed this MfD as an obvious keep, but I leave it to you to update the deletion attempts counter on your userpage :) &spades;]&spades; ] 15:27, 11 November 2022 (UTC)
::::To Premeditated Chaos: Thank you. ] (]) 01:20, 12 November 2022 (UTC)


== Schwarzschild metric ==
::::I do keep a local copy of the source of my user page. But it is not clear that that would be very helpful if there was a determined attack on my privilege of choosing the content of my user page. Thanks for suggesting alternative hosts, but I would rather not use them if I do not have to.
::::By the way, if you want people to refer to you as "she" rather than "he", you should indicate on your user page that you are a woman. For example, although I have not chosen to use userboxes myself, you could put <nowiki>{{User:UBX/female}}, {{User:UBX/female2}} or {{User:UBX/female3}}</nowiki> on your user page. ] (]) 08:24, 1 September 2011 (UTC)
:::::Sure. I'll do that eventually. It's a bit odd for me, because I made this account under my pseudonym rather than my real name so that I can edit articles of a less-scholastic nature without being tracked. So far I haven't really had the need to share much personal information, but you're right that a little would help. Either way, I wasn't remotely offended, and I'm a transsexual woman so I suppose some people wouldn't consider me female anyway (though people who meet me seem to universally assume I am, fortunately).
:::::Good to see your involvement, and thanks for pointing me to the Wikiproject page for the discussion on ] terminology. I'm still learning, and it helps. ] (]) 19:35, 1 September 2011 (UTC)


Hi JRSpriggs!
::::::For other user boxes see ]. ] (]) 03:08, 2 September 2011 (UTC)


I recently edited the Schwarzschild metric page. The main change was to make the domain of definition of the metric more precise. I thought this would be nice as the domain of definition is known exactly, while on the page it is only described as a subset of a certain space, and a reader might reasonably ask which subset. However, my changes ended up affecting other parts of the article, which may not have been helpful.
== Apology ==


Do you think there is a good way to make the domain of definition precise, while keeping in all the other details?
I recently had reason to read through my talk archives, and now with the distance of time, I can see that I have sometimes been peevish and short with you during our disagreements. I wanted to apologize for that. In fact, taken as a whole, you have been remarkably patient with me. For that, my thanks.


Zephyr ] (]) 10:53, 24 November 2022 (UTC)
On another matter, at one point in our discussion, we discussed evidence-based economics. I'd like to note that low inflation continues, just as New Keynesian models predict (acceleration in inflation rate is negatively related to unemployment). As such, I remain staunch in my belief in textbook macroeconomics.


:This article deals with two things: the ] and the coordinate system. The metric is the main topic and other coordinate systems are mentioned. So the metric is not ''being defined'' relative to '''R'''<sup>4</sup>. The metric exists at the horizon as well as the exterior, when the physical conditions are appropriate i.e. vacuum and spherical symmetry.
regards, --] (]) 09:03, 21 July 2011 (UTC)
:I see no justification for your claim that the signature is (+ - - -) rather than (- + + +). ] (]) 20:11, 24 November 2022 (UTC)
::Thanks for the response. Regarding the signature, writing mostly minus when it should have been mostly plus was certainly a slip on my part. Clearly I've been doing too much particle physics recently.
::I didn't mean to suggest that the metric is defined relative to <math>\mathbb{R}^4</math>, but rather that the Scharzschild metric ''in Schwarzschild coordinates'' is well defined on two patches of an underlying Schwarzschild manifold, which in local coordinates are given by open subsets of <math>\mathbb{R}^4</math>. But using the spherical symmetry the open subsets can be replaced with an open subset of <math>\mathbb{R}^2</math> times the sphere.
::I see what you mean by dealing with the metric first, then the coordinate system. The space described, <math>\mathbb{R}\times (E - O)</math> is the underlying manifold. But then the metric is well defined as a tensor field on this whole space (e.g. using incoming Eddington–Finkelstein coordinates), so the '(on a subset of)' remark is misleading in this context. It's really just the '(on a subset of)' which I take issue with, and wish to make more precise. ] (]) 10:35, 25 November 2022 (UTC)


:::The meaning of "subset" is clarified a couple sentences later by "''The Schwarzschild metric is a solution of Einstein's field equations in empty space, meaning that it is valid only outside the gravitating body.''". ] (]) 04:59, 26 November 2022 (UTC)
:Thank you for being concerned about my feelings and apologizing. Actually, I think that few people who disagree with me so strongly would have been as patient as you have.
::::Then why not say for <math>r > R</math> earlier? Besides, it is also legitimate to study the Schwarzschild black hole, which has no outside, and for which the domain of definition of the metric extends to the interior. Sure, this is mentioned in the coordinate system part, but the initial discussion seems to suggest that it is necessary to patch the Schwarzschild solution with an interior solution. ] (]) 11:06, 26 November 2022 (UTC)
:Perhaps you are correct that high unemployment will prevent inflation. However, we need to allow businesses to become more profitable to get the economic expansion that will reduce unemployment. This means that government must focus on reducing the burdens it puts on businesses by: (1) reducing taxes, (2) reducing regulations, and (3) reducing spending which removes inputs from the private sector thereby raising the costs of business. ] (]) 21:34, 21 July 2011 (UTC)


:::::If you want to make a change, then do it rather than trying to talk me into doing it. Of course, any change you make may be reverted or further changed by me or someone else. That is the way Misplaced Pages works.
Let me add another apology / thank you. You are right, of course, to undo my FRW edit. That was a sloppy editing mistake by me; thanks for catching it! ] (]) 19:08, 12 May 2012 (UTC)
:::::I would prefer that you make small localized changes, then wait a day or two for other people to respond or not, before making another small change.
:::::There is not just one interior solution. There is the solution where the future is in the +''r'' direction, a "white" hole. And there is a solution where the future is in the -''r'' direction, a black hole. They are not directly connected to each other, but they both could join to the same exterior solution. However, such a ] converting to a black hole seems highly unphysical to me. ] (]) 02:17, 27 November 2022 (UTC)
::::::Sorry, thanks for the advice. Happy editing! ] (]) 10:15, 28 November 2022 (UTC)


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Please read and comment on the section "]" in the "United States debt-ceiling crisis" talk page. Thanks. --] (]) 11:08, 12 August 2011 (UTC)
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The insert is correct, you can find it in most textbooks (see for example, Rindler) so what qualifies it as "unhelpful"? <small><span class="autosigned">— Preceding ] comment added by ] (] • ]) 04:35, 3 October 2011 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->


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==User page, again==
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I see that there have been a few previous complaints about your user page. However it is still a 7,000-political manifesto. A few hundred words would be one thing, but this is out of proportion. Could you edit it down to a brief summary? &nbsp; <b>]&nbsp; ]&nbsp; </b> 01:44, 5 October 2011 (UTC)
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:Why?
:Out of proportion to what? The edits I have devoted to it are only a tiny proportion of my total edits.
:I could summarize my position by saying that I believe in freedom, but then no one would know what I meant, or rather they would jump to incorrect conclusions about what I believe.
:Is it not said that Misplaced Pages is uncensored? And is my user page not intended to represent me to those who want to learn about me? Anyone who is uninterested in my ideas is free to ignore it. ] (]) 07:22, 5 October 2011 (UTC)
:::It is out of proportion to any reasonable used of a user page. Have you read ]? Pages like yours are routinely deleted. &nbsp; <b>]&nbsp; ]&nbsp; </b> 07:31, 5 October 2011 (UTC)
::::I reduced it by more than half. I really do not want to reduce it any further. ] (]) 12:01, 5 October 2011 (UTC)
:::::Thanks, I appreciate the good faith effort. It's still about six times too long, but I won't pursue it further. &nbsp; <b>]&nbsp; ]&nbsp; </b> 20:45, 5 October 2011 (UTC)


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Nom Comments: Sorry to have to do this, but it seems to have become a pervasive issue and it needs to be resolved.] (]) 17:40, 14 October 2011 (UTC)
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If you have time can you review my changes to Regular cardinal? I'd appreciate it! ] (]) 10:07, 21 July 2024 (UTC)
:You may or may not be interested, but all of the parts of your manifesto that are relevant to me (e.g. not the parts concerning political / economic / social conditions in the US about which I know little) I completely agree with, in particular your miscellaneous bits at the end. Thought I'd mention it because I have found it can be good to feel that one is not alone in one's views. --] 20:33, 26 October 2011 (UTC)


::My thanks to Matt Westwood and to all those who supported me at the MfD. ] (]) 06:05, 27 October 2011 (UTC) :Your change appears to be correct. ] (]) 03:59, 22 July 2024 (UTC)
::Thanks, but now I've made another change,. Can you check that too?] (]) 13:56, 24 July 2024 (UTC)
:::Please provide a link there to a ] source. Thanks. ] (]) 16:28, 25 July 2024 (UTC)
::::I have no idea what a reliable source for most questions in set theory would be, especially this one. Also, according to Ayn Rand, I have no obligation to do so even if I were qualified.] (]) 12:05, 28 July 2024 (UTC)


:::::You have no obligation to follow the rules of Misplaced Pages, but if you fail to do so then they are more likely to revert your edits or possibly even ban you from editing. ] (]) 15:00, 31 July 2024 (UTC)
== Comsumer ==
::::::That's bogus..I edited the article because of some very ambiguous and confusing statements, that have been there for years, uncited, possibly due to translation from another wikipedia, idk. There's no way I could know for sure about the truth, I just edited it say what was most likely the intent. You've tried to get me find sources for something that was written (but unclear) by someone else and been there for a long time, and I'm obviously unqualified to find or understand the references. That's manipulative, and unworthy of John Galt.] (]) 13:33, 5 August 2024 (UTC)
Thanks for that. It was simply a type on my part. Will be fixed in the next few minutes. --] <sup>]</sup> 17:32, 26 October 2011 (UTC)
:No problem. Sometimes I forgot to read what I actually type. :) --] <sup>]</sup> 09:28, 27 October 2011 (UTC)


I am not trying to manipulate you. If anything, it is the other way around. I have no more knowledge of this particular issue than you do; and I no longer have access to the library that used to support my research. You are the one who is hitting me over the head with references to Ayn Rand and John Galt to try to make me do what I cannot do. ] (]) 16:30, 5 August 2024 (UTC)
== Thanks ==


:I took what you were saying in the wrong way sorry. I didn't realize this wasn't something you were currently expert in. Neither of us can do citations on it , but whether it's correct now or not, it's my best guess as to what was meant. I also asked another set theory person, so we'll see. Anyway neither of us are able to provide citations, I hope I didn't imply I wanted you to find citations, I'd be content for correctness and clarity in the article, for now. Anyway , my forst reference to Ayn Rand was meant lightheartedly, I'm sorry I got huffy with my John Galt comparison.Peace.] (]) 23:01, 5 August 2024 (UTC)
Thanks for this, I appreciate it. ] (]) 14:04, 27 October 2011 (UTC)
::I just now put citation needs in that section, missing since 2008 23:21, 5 August 2024 (UTC) ] (]) 23:21, 5 August 2024 (UTC)


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:You are welcome. As I said above in a different context, user pages are to represent that particular user, not someone else. ] (]) 04:55, 28 October 2011 (UTC)
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== Bit puzzled ==


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Hi JRSpriggs, I'm a bit puzzled about the purpose of {{diff||464419764|464375288|this edit}} in response to my last reply at ]. Did you perhaps somehow misplace this? Cheers - ] (]) 11:23, 7 December 2011 (UTC)


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:I am sorry that I did not make it clear that it was addressed to Sugdub rather than to you. I just occurred to me that perhaps he would benefit from seeing a spacetime diagram of how length is measured for a moving object and that was the only one I could find on the commons. ] (]) 17:23, 7 December 2011 (UTC)


'''<span style="color: red;">This bot DID NOT nominate any of your contributions for deletion; please refer to the ] of each individual page for details.</span>''' Thanks, ] (]) 10:00, 6 October 2024 (UTC)
::Ah... a piece of the puzzle :-) Ok, Cheers - ] (]) 17:30, 7 December 2011 (UTC)


== 2 vs 3 digits == == ArbCom 2024 Elections voter message ==
Hi JRSpriggs, I did a diff and did not see your comment before I re-inserted my correction to two digits on ]. I thought it was a vandal edit. I am an engineer, so i'm used to significant digits, but i see you are a mathematician. Can you please explain or send me to a link on the 'ok if last digit off' part? Thanks ] (]) 01:44, 20 December 2011 (UTC)


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:I can understand your desire to round off to the nearest digit, but that is not possible in general. For example, if ''x'' is only known to be between 3.3 and 3.6, then ''x'' could be described as "3 to one digit" or "4 to one digit" with equal validity. The best one can do as a consistent practice is to round to one of the two closest digits. And consider 3.48, if it is rounded to two digits, then it becomes 3.5. And then 3.5 is usually rounded to 4 (the even digit of {3, 4}) to one digit. However by your rule, rounding from 3.48 to 4 to one digit would be unacceptable.
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:And practically, the rule I use allows one to preserve more information than your rule allows in the case which appeared in the article. ] (]) 17:46, 20 December 2011 (UTC)
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:: Indeed there are many problems with any of these approaches (including multiple roundings, the fact that 3 to 1 digit and 4 to 1 digit have zero overlap, etc). I think what you last wrote (decimal expansion starts with...) does preserve the most information. Good job. ] (]) 16:49, 21 December 2011 (UTC)


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:::The compromise you mentioned (re decimal expansion) was not my work. It was put in by {{user|Isheden}}. I advise you to follow my practice and always read the new entries in the revision history carefully before editing. ] (]) 02:05, 22 December 2011 (UTC)


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== Spelling corrections ==
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JRSpriggs, you made some spelling corrections on ]. While I share your irritation with bad spelling, it's not generally recommended that you edit comments by others (see ]). ] (]) 01:38, 3 January 2012 (UTC)

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It's OK to remove this message. Also, to stop receiving these messages, follow these ]. Thanks, ] (]) 10:31, 26 February 2012 (UTC)

:Thanks for pointing that out. I have disambiguated the link. ] (]) 09:18, 27 February 2012 (UTC)

==Addison not Addision of course==

I was responsible for the misspelling (which you will not be surprised by), and have now corrected its origin

:''"Quantum Mechanics, E. Abers, Pearson Ed., '''Addi<u>sion</u>''' Wesley, Prentice Hall Inc, 2004, ISBN 9780131461000''

to

:''"Quantum Mechanics, E. Abers, Pearson Ed., '''Addi<u>son</u>''' Wesley, Prentice Hall Inc, 2004, ISBN 9780131461000''

on my own user page in the references section. I haven’t been using WP much recently so didn't notice your post at wikiproject physics ] a few days ago.

Sorry to waste so much of yours (and whoever made the corrections) time... =( <span style="font-family:'TW Cen MT';">] ] ]</span> 16:06, 25 March 2012 (UTC)

== Main page appearance: General relativity ==

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<blockquote>
<div style="float:left;margin:0.5em 0.9em 0.4em 0;">]</div>

''']''' is the ] ] of ] published by ] in 1916. It is the current description of gravitation in ]. General relativity generalises ] and ], providing a unified description of gravity as a geometric property of ] and ]. In particular, the ] of spacetime is directly related to the ] of whatever ] and ] are present. The relation is specified by the ]. Some predictions of general relativity differ significantly from those of classical physics. Examples of such differences include ], ], the ] of light, and the ]. General relativity's predictions have been confirmed in all ] to date. Although general relativity is ], it is the ] that is consistent with experimental data. However, unanswered questions remain, the most fundamental being how general relativity can be reconciled with the laws of ] to produce a complete and self-consistent theory of ]. (])
</blockquote>
] (]) 23:01, 17 April 2012 (UTC)

== RE: Failure of protection ==

Hi. I only ]. Hope this answers your question. ] (]) 20:03, 19 April 2012 (UTC)

:Thank you for clarifying that. I had been under the impression that the featured article of the day was normally given at least protection against IP-users and new users, i.e. semi-protection. I have now been informed that that is not the policy. Still, I feel that it ''should be'' the policy. ] (]) 21:11, 19 April 2012 (UTC)

== Conjugate Variables: Derivation from Action ==
Hi JR, thank you for your edits.
Can you expand your edit for ], you've edited that "the derivatives of action are conjugate variables to the quantity with respect to which one is differentiating", but there's no reference for this or elaboration of how it's down.

Also, your units don't make sense, they way you have presented indicates that all conjugated variables in physics are governed by Planck's constant, however, plugging the units in for potential and charge density I get which is close to = but not. Could you explain in more detail your reasoning? <small><span class="autosigned">— Preceding ] comment added by ] (] • ]) 02:10, 21 April 2012 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

your's sincerely - Lars <small><span class="autosigned">— Preceding ] comment added by ] (] • ]) 00:06, 21 April 2012 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

:<s>The last equation in the section ] says that the Lagrangian density of the electromagnetic field is
::<math> \mathcal{L} \, = \, \frac12 (\epsilon_{0} E^2 - \frac{1}{\mu_{0}} B^2) - \phi \, \rho_{\text{free}} + \boldsymbol{A} \cdot \boldsymbol{J}_{\text{free}} + \boldsymbol{E} \cdot \boldsymbol{P} + \boldsymbol{B} \cdot \boldsymbol{M} \,</math>
:while the action is
::<math>S = \int \mathcal{L} \, dx dy dz dt \,.</math>
:Strictly speaking, varying a variable at one point will not affect the integral. To change the integral, one must make the variation over a hyper-volume of space-time
::<math>\Delta x \Delta y \Delta z \Delta t \,</math>
:which has units . So we need to differentiate the action with respect to the charge density within a unit hyper-volume in order to get the electric potential. Thus take and multiply it by which gives the desired . A similar thing must be done with the other conjugate pairs in field theory.</s> ] (]) 07:34, 21 April 2012 (UTC)

::On second thought, what I was saying was nonsense. Instead of relying on my error-prone memory, I need to look this up in a text book and get back to you. ] (]) 04:57, 24 April 2012 (UTC)

:::I have not been able to find it in my textbooks. But on further thought, I believe that there is no conjugate variable for the electric scalar potential, &phi;; and the conjugate variable for the electromagnetic vector potential, '''''A''''', is the negative of the electric displacement, &minus;'''''D'''''. Similarly, there is no conjugate variable for the Newtonian gravitational scalar potential. In this case, the units of the product &minus;'''''A&middot;D''''' should be the same as action divided by a unit (3-)volume.
:::When you apply the calculus of variations to derive the Euler-Lagrange equations from the principle of least action, there usually are terms which come from integration by parts and take form of integrals over the 3-dimensional boundary of the 4-dimensional hyper-volume over which you are integrating the variation in the Lagrangian density. The conjugate variables are found from those boundary terms. For example in this case, the boundary integral's integrand is &minus;'''''D&middot;'''''&delta;'''''A'''''. ] (]) 19:05, 26 April 2012 (UTC)

Dear JR,
:: <s>Is it possible you are confusing intensive and extensive variables in ] with the ]s of the ]?

:: The conjugate variables in the Heisenberg uncertainty relation are related through their Fourier transform duals, whereas the conjugate variables in thermodynamic properties are related through ] which are taken as derivatives of thermodynamic potentials.</s>

After some thought I see where you're coming from, and how taking derivatives of the Lagrangian gives conjugate pairs, c.f. ], and your approach makes a lot of sense.

::It's a pity V and &phi; aren't conjugate, I really could have done something useful with that.

::Despite all that, I think you should continue with your edit, hopefully you can show V and &phi; are Fourier transform duals.

:: your's sincerely - Lars <small><span class="autosigned">— Preceding ] comment added by ] (] • ]) 00:14, 27 April 2012 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

:As you indicate, there is a notion of conjugate variables in thermodynamics, but that is distinct from the notion of conjugate variables in mechanics which is what I was addressing. There is a separate article on conjugate variables in thermodynamics.
:Could you clarify what you mean by ''V'' and &phi;? If you mean voltage and the electric scalar potential, they are the same thing (only the name is changed). ] (]) 12:03, 28 April 2012 (UTC)

== ] ==

Hi, this article is awesome, the first time I have seen such a complete and transparent summary for this concept.

{| style="border: 1px solid gray; background-color: #fdffe7;"
|rowspan="2" valign="middle" | {{#ifeq:alt|alt|]|]}}
|rowspan="2" |
|style="font-size: x-large; padding: 0; vertical-align: middle; height: 1.1em;" | '''The Teamwork Barnstar'''
|-
|style="vertical-align: middle; border-top: 1px solid gray;" | This is to be shared between:
*] - the original author,
*] - historical content, accuracy and sources,
*], ], ] - corrections and mathematical accuracy, clean up, clarification etc. ] (]) 16:32, 20 May 2012 (UTC)
|}

Well done and thanks to you all, and sorry this is so late (I would have awarded this earlier but don't get on WP much anymore). Best, ] (]) 16:32, 20 May 2012 (UTC)

:You are welcome. ] (]) 21:11, 20 May 2012 (UTC)

== Was that all? ==

You could have disagreed with my summary of the source without accusing me of editing under false pretenses, you know. I pared down that bullet point a bit, see if you still like it: https://en.wikipedia.org/search/?title=United_States_debt-ceiling_crisis&diff=495617632&oldid=495606587. We can move to the article's talk page if you think there is anything else we need to take care of. ] (]) 13:43, 2 June 2012 (UTC)

:I did not mean to imply that you were intentionally doing anything wrong. I merely meant that your edit was one-sided.
:This is a difficult issue to address since how one describes the situation has implications for who (Republicans or Democrats) gets the blame. And it may be hard for a reader to separate what S&P is saying (which is deliberately vague to avoid offending one party or the other) from what Misplaced Pages is saying. ] (]) 03:31, 3 June 2012 (UTC)

::''I did not mean to imply that you were intentionally doing anything wrong.'' - thank you. Happy Sunday! ] (]) 19:17, 3 June 2012 (UTC)

== I hope you check you recent assertions ==

A tensor basis of a given type can be expressed as the tensor product of possibly different sets of vector bases. This is mathematically sensible; if your thinking becomes too component-centric rather than being in terms of the actual (abstract) tensors, you can lose sight of this. Your recent edit comment about the Kronecker delta and Lorentz transform shows up the difference in our perspectives. I do not intend to argue this with you. — ]] 11:20, 19 June 2012 (UTC)

:Some things may be tensors in a mathematical sense which are not tensors in the sense of general relativity physics. Just as one might say that any space of tensors is a vector space in a mathematical sense, but not in a physical sense. In physics, we are focusing on particular mathematical objects which are useful in modeling reality, not just on anything that someone can imagine. ] (]) 07:09, 20 June 2012 (UTC)

== Intolerable behaviour by new ] ==

Hello. This message is being sent to inform you that there is currently a discussion at ] regarding the intolerable behaviour by new ]. The thread is ]. <!--Template:ANI-notice--> Thank you.

(I had to include you by WP:ANI guidelines, sorry...)

] ]] 23:06, 9 July 2012 (UTC)

:Thank you for letting me know about that thread. ] (]) 03:25, 10 July 2012 (UTC)

::Fuckscrew that - instead please desist from whipping up so much opposition. '''I apologized already'''. Why block?? ] (]) 12:06, 10 July 2012 (UTC)

Latest revision as of 00:10, 19 November 2024

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Userpage nominated for deletion

Hello, JRSpriggs. Your userpage was recently nominated for deletion a second time by Sundostund. I didn't see that a notification was placed on your talkpage about this, and several !voters in the MfD asked that you be contacted first regarding the contents of your talkpage before proceeding with the deletion discussion. The nominator believed your userpage violated WP:NOTWEBHOST, WP:SOAPBOX, WP:UPNOT and WP:POLEMIC. I leave it to the two of you to determine if a middle ground can be reached on this, but I will say that although I had nominated your userpage for deletion in the past, I did not endorse the move to delete your page this time around. 🌈WaltCip-(talk) 15:26, 9 November 2022 (UTC)
Just for the record – if Sir Nicholas de Mimsy-Porpington wasn't listed as the original creator of JRSpriggs' userpage (by making this edit back in 2007), then JRSpriggs would receive an automatic notification, by Twinkle, about the ongoing MfD nomination. As can be seen, the notification ended up here. — Sundostund mppria 15:40, 9 November 2022 (UTC)
Allowing me 33 kilobytes to explain myself and my beliefs is a small price to pay for all my contributions to the encyclopedia's content and financial donations. JRSpriggs (talk) 03:33, 10 November 2022 (UTC)
Hello JR! I have snow closed this MfD as an obvious keep, but I leave it to you to update the deletion attempts counter on your userpage :) ♠PMC♠ (talk) 15:27, 11 November 2022 (UTC)
To Premeditated Chaos: Thank you. JRSpriggs (talk) 01:20, 12 November 2022 (UTC)

Schwarzschild metric

Hi JRSpriggs!

I recently edited the Schwarzschild metric page. The main change was to make the domain of definition of the metric more precise. I thought this would be nice as the domain of definition is known exactly, while on the page it is only described as a subset of a certain space, and a reader might reasonably ask which subset. However, my changes ended up affecting other parts of the article, which may not have been helpful.

Do you think there is a good way to make the domain of definition precise, while keeping in all the other details?

Zephyr Zephyr the west wind (talk) 10:53, 24 November 2022 (UTC)

This article deals with two things: the Schwarzschild metric and the coordinate system. The metric is the main topic and other coordinate systems are mentioned. So the metric is not being defined relative to R. The metric exists at the horizon as well as the exterior, when the physical conditions are appropriate i.e. vacuum and spherical symmetry.
I see no justification for your claim that the signature is (+ - - -) rather than (- + + +). JRSpriggs (talk) 20:11, 24 November 2022 (UTC)
Thanks for the response. Regarding the signature, writing mostly minus when it should have been mostly plus was certainly a slip on my part. Clearly I've been doing too much particle physics recently.
I didn't mean to suggest that the metric is defined relative to R 4 {\displaystyle \mathbb {R} ^{4}} , but rather that the Scharzschild metric in Schwarzschild coordinates is well defined on two patches of an underlying Schwarzschild manifold, which in local coordinates are given by open subsets of R 4 {\displaystyle \mathbb {R} ^{4}} . But using the spherical symmetry the open subsets can be replaced with an open subset of R 2 {\displaystyle \mathbb {R} ^{2}} times the sphere.
I see what you mean by dealing with the metric first, then the coordinate system. The space described, R × ( E − O ) {\displaystyle \mathbb {R} \times (E-O)} is the underlying manifold. But then the metric is well defined as a tensor field on this whole space (e.g. using incoming Eddington–Finkelstein coordinates), so the '(on a subset of)' remark is misleading in this context. It's really just the '(on a subset of)' which I take issue with, and wish to make more precise. Zephyr the west wind (talk) 10:35, 25 November 2022 (UTC)
The meaning of "subset" is clarified a couple sentences later by "The Schwarzschild metric is a solution of Einstein's field equations in empty space, meaning that it is valid only outside the gravitating body.". JRSpriggs (talk) 04:59, 26 November 2022 (UTC)
Then why not say for r > R {\displaystyle r>R} earlier? Besides, it is also legitimate to study the Schwarzschild black hole, which has no outside, and for which the domain of definition of the metric extends to the interior. Sure, this is mentioned in the coordinate system part, but the initial discussion seems to suggest that it is necessary to patch the Schwarzschild solution with an interior solution. Zephyr the west wind (talk) 11:06, 26 November 2022 (UTC)
If you want to make a change, then do it rather than trying to talk me into doing it. Of course, any change you make may be reverted or further changed by me or someone else. That is the way Misplaced Pages works.
I would prefer that you make small localized changes, then wait a day or two for other people to respond or not, before making another small change.
There is not just one interior solution. There is the solution where the future is in the +r direction, a "white" hole. And there is a solution where the future is in the -r direction, a black hole. They are not directly connected to each other, but they both could join to the same exterior solution. However, such a white hole converting to a black hole seems highly unphysical to me. JRSpriggs (talk) 02:17, 27 November 2022 (UTC)
Sorry, thanks for the advice. Happy editing! Zephyr the west wind (talk) 10:15, 28 November 2022 (UTC)

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Regular cardinal

If you have time can you review my changes to Regular cardinal? I'd appreciate it! Rich (talk) 10:07, 21 July 2024 (UTC)

Your change appears to be correct. JRSpriggs (talk) 03:59, 22 July 2024 (UTC)
Thanks, but now I've made another change,. Can you check that too?Rich (talk) 13:56, 24 July 2024 (UTC)
Please provide a link there to a WP:RELIABLE source. Thanks. JRSpriggs (talk) 16:28, 25 July 2024 (UTC)
I have no idea what a reliable source for most questions in set theory would be, especially this one. Also, according to Ayn Rand, I have no obligation to do so even if I were qualified.Rich (talk) 12:05, 28 July 2024 (UTC)
You have no obligation to follow the rules of Misplaced Pages, but if you fail to do so then they are more likely to revert your edits or possibly even ban you from editing. JRSpriggs (talk) 15:00, 31 July 2024 (UTC)
That's bogus..I edited the article because of some very ambiguous and confusing statements, that have been there for years, uncited, possibly due to translation from another wikipedia, idk. There's no way I could know for sure about the truth, I just edited it say what was most likely the intent. You've tried to get me find sources for something that was written (but unclear) by someone else and been there for a long time, and I'm obviously unqualified to find or understand the references. That's manipulative, and unworthy of John Galt.Rich (talk) 13:33, 5 August 2024 (UTC)

I am not trying to manipulate you. If anything, it is the other way around. I have no more knowledge of this particular issue than you do; and I no longer have access to the library that used to support my research. You are the one who is hitting me over the head with references to Ayn Rand and John Galt to try to make me do what I cannot do. JRSpriggs (talk) 16:30, 5 August 2024 (UTC)

I took what you were saying in the wrong way sorry. I didn't realize this wasn't something you were currently expert in. Neither of us can do citations on it , but whether it's correct now or not, it's my best guess as to what was meant. I also asked another set theory person, so we'll see. Anyway neither of us are able to provide citations, I hope I didn't imply I wanted you to find citations, I'd be content for correctness and clarity in the article, for now. Anyway , my forst reference to Ayn Rand was meant lightheartedly, I'm sorry I got huffy with my John Galt comparison.Peace.Rich (talk) 23:01, 5 August 2024 (UTC)
I just now put citation needs in that section, missing since 2008 23:21, 5 August 2024 (UTC) Rich (talk) 23:21, 5 August 2024 (UTC)

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