Validity - Valid Formula

Valid Formula

A formula of a formal language is a valid formula if and only if it is true under every possible interpretation of the language. In propositional logic, they are tautologies.

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Famous quotes containing the words valid and/or formula:

    Just as soon as we notice that someone has to force himself to pay attention when dealing and talking with us, we have a valid demonstration that he does not love us or that he does not love us anymore.
    Friedrich Nietzsche (1844–1900)

    I take it that what all men are really after is some form or perhaps only some formula of peace.
    Joseph Conrad (1857–1924)