∾
From Wiktionary, the free dictionary
See also: Appendix:Variations of "="
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Description
An inverted lazy S.
Symbol
∾
- (mathematics) logical negation[1]
Usage notes
Resembles manuscript variants of the infinity sign, ∞ (e.g. in Euler's notebooks).
References
- Kurt Gödel, "Über formal unentscheidbare Sätze der Principia Mathematica und verwandter Systeme I" (1931), DOI 10.1007/BF01700692, page 177
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