PHIL 110 Lecture 7: Lecture 7
15 Mar 2016
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If there are carved pumpkins at many people"s doors, then we are close to halloween. There is not carved pumpkins at many people"s doors. We are not close to halloween. (premises are true but conclusion is false, because we could be living in an apartment building where pumpkins at the door are uncommon) Rules of inference: modus ponens (mp) p -> q, p therefore q, modus tollens (mt) p -> q, ~q therefore ~p, double negation (dn) ~~ p therefore p, p therefore ~~ p. Other words than the words and can be used to speak of the symbolization & but, even though, although, however, despite the fact that etc. Sometimes, and does not represent that statement & . It"s impossible to nd decent sh and chips in ontario . It"s not saying that its impossible to nd decent sh in ontario and that its impossible to.
