SSH 100 Lecture Notes - Lecture 5: Necessity And Sufficiency
7 May 2016
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When we are trying to decide on what to believe we rule out options and pick whatever is left. P and q are the disjuncts a disjunction asserts neither disjuncts but asserts that one of them is true. Denying disjuncts: p or q, if not p, so, q both (1) and (2) need to be there to make the conclusion (3) valid. If both disjuncts are false then the whole disjunction is false. For a disjunction to be true three has to be at least one disjuncts true. Even if the argument is valid if u start with a false disjunction than the conclusion will always be false. Exhaustive disjunctions are ones with all of the possibilities. Accepting the disjuncts if u cant think of other possibilities, or find other possibilities. It is a mistake to believe something just because it has not been proven false. Affirming a disjuncts: p or q, p, not q (so)
