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We prove that the provability logic of all provability predicates is exactly Fitting, Marek, and Truszczyński’s pure logic of necessitation . Moreover, we introduce three extensions , , and of and investigate the arithmetical semantics of these logics. In fact, we prove that , , and are the provability logics of all provability predicates satisfying the third condition of the derivabiity conditions, all Rosser’s provability predicates, and all Rosser’s provability predicates satisfying , respectively.

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