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mathematical logic > logical constant

logical constant

In logic, a logical constant or constant symbol of a language ${\\displaystyle {\\mathcal {L}}}$ is a symbol that has the same semantic value under every interpretation of ${\\displaystyle {\\mathcal {L}}}$ . Two important types of logical constants are logical connectives and quantifiers. The equality predicate (usually written '=') is also treated as a logical constant in many systems of logic.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Logical_constant)

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