On the recognition of the tautological nature of propositional formulas
Zapiski Nauchnykh Seminarov POMI, Studies in constructive mathematics and mathematical logic. Part VII, Tome 60 (1976), pp. 197-206
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A formal language whose propositions express (in some sense) the properties of propositional formulas is described in the paper. For a certain subset of propositions of this language it is proved that each of them defines a class of propositional formulas, on which it is possible to recognize the tautological nature in a time polynomially dependent on the formula's length.