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The Concept of the A Priori
The Problem of Entailment
Laws of Logic and Rules of Inference
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according argued assert called categorical proposition characterisation cognitive content concept conclusion consequence consider contingent contrapositive deductive inference definite description disconfirmation empiricists entails q Equivalence Condition example existence expresses something true fact false follows formulation Frege Hempel idea identity Identity of Indiscernibles illustrative symbol individual inductively equivalent interpretation kind Kripke latter law of logic least Leibniz logically equivalent logicians maintain material implication mathematical logic meaning Mill monad mortal necessarily true necessary propositions necessary truth non-black things object particular philosophical logic place marker possible predicate premise principle priori propositions problem problem of induction proper name properties question raven hypothesis ravens are black reason reference rejected relation Relevant Relevant rigid designator rules of inference Russell seems sense sentence frame sentence Socrates Socrates Socrates is wise statement substitution instance substitution-instance term thesis things are non-ravens tion universal quantification valid variables W. V. Quine white handkerchief words