∅

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See also: ∅-, -∅, -∅-, Ø , ⌀ , and ø

∅ U+2205, ∅
EMPTY SET
← ∄
 		Mathematical Operators ∆ →

⦰ U+29B0, ⦰
REVERSED EMPTY SET
← ⦯
 		Miscellaneous Mathematical Symbols-B ⦱ →

Translingual

English Wikipedia has an article on:
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English Wikipedia has an article on:
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English Wikipedia has an article on:
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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 Norwegian letter Ø.

Symbol

∅

  1. (set theory) A set with no elements: the empty set.
    Synonyms: { }, {}
  2. (linguistic morphology) 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.

See also

References

  1. ^ A. Weil, The Apprenticeship of a Mathematician, chapter V "Strasbourg and Bourbaki", p. 114; Birkhäuser Verlag 1992

Vietnamese

Etymology

From the empty set symbol.

Adjective

∅

  1. Abbreviation of trống (“empty”).
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