Logical law
From HandWiki
in mathematical logic
A logical formula that becomes a true proposition under any interpretation of the variables for propositions and predicates that occur in it. Such formulas are called generally valid, universally valid or tautologies. For example, the tautology $A\lor\neg A$ expresses the law of the excluded middle.
Comments
References
| [a1] | A. Grzegorczyk, "An outline of mathematical logic" , Reidel (1974) |
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