PHIL 1115 Lecture Notes - Lecture 1: Logical Truth
10 Dec 2014
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You don"t know whether or not it is true. If the redsox scored more runs than the tigers yesterday, then they won. When is this true? (there is an apple or a banana on the table: when a is true & b is not true, when b is true & a is not true, when both a & b are true true deductive argument the truth of the premises is supposed to guarantee the truth of the conclusion inductive argument the truth of the premises is supposed to make the truth of the conclusion much more probable. An argument is valid if and only if it is impossible for the premises to be true and the conclusion false. Organisms that self sacrifice for the benefit of others are altruistic. Tautology (logical truth): a sentence is a tautology (logically true) if and only if it is impossible for it to be false.
