The logic of conditionals1

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Abstract
The standard use of the propositional calculus ('P.C.’) in analyzing the validity of inferences involving conditionals leads to fallacies, and the problem is to determine where P.C. may be ‘safely’ used. An alternative analysis of criteria of reasonableness of inferences in terms of conditions of justification rather than truth of statements is proposed. It is argued, under certain restrictions, that P. C. may be safely used, except in inferences whose conclusions are conditionals whose antecedents are incompatible with the premises in the sense that if the antecedent became known, some of the previously asserted premises would have to be withdrawn.

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