puhekieltä The property of a logical theory that whenever a wff is valid then it must also be a theorem. Symbolically, letting T represent a theory within logic L, this can be represented as the property that whenever is true, then must also be true, for any wff φ of logic L.
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THEOREM 37°. (Gödel's completeness theorem 1930.) In the predicate calculus H: (a) Ifor even if -, then . Ifor even if -, then . (b) ...