Logic symbols

Descending wedge

The descending wedge symbol ∨ may represent: * Logical disjunction in propositional logic * Join in lattice theory * The wedge sum in topology The vertically reflected symbol, ∧, is a wedge, and often denotes related or dual operators. The ∨ symbol was introduced by Russell and Whitehead in Principia Mathematica, where they called it the Logical Sum or Disjunctive Function. In Unicode the symbol is encoded U+2228 ∨ LOGICAL OR (∨, ∨). In TeX, it is \vee or \lor. One motivation and the most probable explanation for the choice of the symbol ∨ is the latin word "vel" meaning "or" in the inclusive sense. Several authors use "vel" as name of the "or" function. (Wikipedia).

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Related pages

Propositional calculus | Duality (mathematics) | Principia Mathematica | Wedge sum | List of logic symbols | Bertrand Russell | Join and meet | Topology | Alfred North Whitehead | Wedge (symbol) | Logical disjunction | Lattice (order)