PHL 214 Chapter Notes - Chapter 3: Modus Ponens, Modus Tollens, Hypothetical Syllogism
2 Jan 2018
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Document Summary
Devising an argument - show that a statement/claim is worthy of acceptance. Evaluating an argument - see whether the task has been successful. Deductive argument: intended to provide logically conclusive support (structure) for its conclusion. Is valid or invalid: valid : false premises - conclusion may be true or false. Inductive argument: intended to provide probable (not conclusive) support for its conclusion. Is weak to strong (scale: cogent - strong, true premises. Valid: argument succeeds in providing such decisive logical support. Invalid: fails to provide such support: deductively valid - if premises are true; conclusion must be true. Cogent: inductively strong arguments have true premises (for inductive arguments) Sound: argument is valid and has true premises (for deductive arguments) If argument looks (in)deductive because of form it is intended to be so. If an argument is valid, it can"t have true premises with a false conclusion.
