Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun set theory A set with no elements: the
empty set . - noun linguistics A symbol for a
null form.Ø is commonly used instead.
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
The set-theoretic meaning of this symbol was introduced by Nicolas Bourbaki in his treatise Éléments de mathématique.
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Examples
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