∅
Template:Also Template:Character info Template:Character info Template:Character image
Translingual
Template:Wp Template:Wp Template:Wp
Etymology
The set-theoretic meaning of this symbol was introduced by the Bourbaki group in their treatise Éléments de mathématique. André Weil has said in his autobiography that he based it on the Template:Der letter Template:L.[1]
Symbol
- Template:Lb A set with no elements: the empty set.
- Template:Lb A null morpheme; a theoretical morpheme used in models of linguistic analysis to represent the absence of a morpheme where one might otherwise be expected.
Usage notes
Unicode enables a variant that looks like a slashed zero, 0︀, by following ∅ with Variation Selector 1 (U+FE00).[2]
See also
References
- ↑ A. Weil, The Apprenticeship of a Mathematician, chapter V "Strasbourg and Bourbaki", p. 114; Birkhäuser Verlag 1992
- ↑ https://www.unicode.org/L2/L2015/15268-slashed-zero.pdf
Vietnamese
Etymology
From the empty set symbol.