Horseshoe (symbol)

Horseshoe[1] (⊃, \supset in TeX) is a symbol used to represent:

This article is about the mathematical logic and sets symbol "⊃". For the set symbol "⊂", see subset. For symbology of iron horseshoes, see horseshoe. For other uses, see horseshoe (disambiguation).

It was used by Russell and Whitehead in Principia Mathematica. In Unicode the symbol is encoded U+2283 ⊃ SUPERSET OF (HTML ⊃ · ⊃, ⊃, ⊃).

See also

References
  1. Whitehead, A.N., and Russell, Bertrand, Principia Mathematica
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