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Creative Elements in Science
Logical Foundations of Probability Theory
On the Concept of Magnitude
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argument Aristotelian Aristotle asserted axiomatic Calculus of Propositions CCpqCCqrCpr concept consequence consists CpCqp deductively equivalent defined definition denote derived equal equivalential system example fact falsehood formal logic formula functions functor hence home tomorrow noon Implicational Calculus implicational propositional calculus indefinite proposition interpreted intuitionistic intuitive Jan Lukasiewicz judgements law of bivalence Lesniewski less letters logical value logiki logistic many-valued systems mathematical logic meaningful expressions means method modal logic natural numbers negation normal matrix obtain Peirce's law philosophical possible premisses principle principle of bivalence probability problem proof propo propositional logic propositional variables proved Przeglqd Filozoficzny reason rejected relation rule of detachment rule of substitution rules of inference satisfied sentence sentential calculus sitions sole axiom Stoic substitution and detachment syllogism syllogistic symbol system of axioms system of propositional Tarski theorem theory of deduction thesis tion true nor false truth value two-valued logic valid verified Wajsberg Warsaw yields