PHL 214 Study Guide - Final Guide: Logical Reasoning, Logical Consequence, A Priori And A Posteriori
8 Aug 2018
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Document Summary
There are a test of the cogency of an argument: Is it rationally thinkable: this means that the cogency of an argument requires acceptable premises, relevant premises, and good grounds for adopting the conclusion. Often referred to as simply validity, deductive entailment is a tight logical relation where, when the premises are true, the conclusion must be true. Andrew is not a member of the club. If the premises are true, then the conclusion has to be true. For deductively valid arguments, it is never possible for the conclusion to be false when all the premises are true. Validity does not come in degrees deductive arguments are either valid or not valid. Deductively valid arguments satisfy both the r and the g conditions for cogency of arguments. Inductive support is evidence (as opposed to reasons) that support the conclusion in a manner less certain than that of deductively valid arguments.
