PHIL 210 Chapter Notes - Chapter 2: Logical Consequence, Validity, Formal System
15 Dec 2017
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Main concern in logic is logical consequence fol was designed so that it could be. 2. 0 easy to make logical consequences clear as opposed to ambiguities of ordinary language. 2. 1 argument: series of statements where one statement conclusion is followed from the. Arguments are logically valid if the conclusion is a logical consequence of premises i. e. if and only if the conclusion must be true on the assumption that the premises are true. Hence/thus/so/consequently" indicates conclusion; because/since/after all" etc. indicates premises. Logical validity is independent of truth of conclusion, because that depends on truth of premises. Ex you can have valid arguments on false premises, which lead to false (but logically valid from the premises) conclusions. If an argument is valid and the premises are also valid then the argument is sound. Example of an unsound valid argument: all rich actors are good actors; brad pitt is a rich actor; so brad pitt is a good actor.
