Umbral is derived from the Latin word umbra, meaning "shadow". It is also the Spanish and Portuguese word for "threshold" and is sometimes used as a surname in those languages.
Umbral may also refer to:
- Umbral calculus, the surprising similarity between seemingly unrelated polynomial equations and certain shadowy techniques used to "prove" them
- Umbral moonshine, a mysterious connection between Niemeier lattices and Ramanujan's mock theta functions
- Francisco Umbral (1932–2007), Spanish journalist, novelist, biographer and essayist
See also
Topics referred to by the same term
This disambiguation page lists articles associated with the title Umbral.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: