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| In ], a decimal cologarithm is indicated by the letter p (originally the Greek letter ρ){{Fact|date=June 2009}}.<br />For example, ] = – log<sub>10</sub> ''K'' and ] = – log<sub>10</sub> . | In ], a decimal cologarithm is indicated by the letter p (originally the Greek letter ρ){{Fact|date=June 2009}}.<br />For example, ] = – log<sub>10</sub> ''K'' and ] = – log<sub>10</sub> . | ||
| *[According to Google, the cologarithm of x is the logarithm of (1/x.) | |||
| In 40 years doing maths and engieering, I never heard of this before today. | |||
| It seems a completely pointless bit of terminology, because log(1/x) is just -log x.] | |||
| == References == | == References == | ||
Revision as of 09:46, 17 June 2011
In mathematics, the base-b cologarithm, sometimes shortened to colog, of a number is the base-b logarithm of the reciprocal of the number. It is equal to the negative base-b logarithm of the number.
In chemistry, a decimal cologarithm is indicated by the letter p (originally the Greek letter ρ).
For example, pK = – log10 K and pH = – log10 .
References
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