SSH 205 Lecture 5: SSH105 Week Five Lecture Notes
15 Jul 2016
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Conjunction: sentence with the word and in it: ex: ayesha likes apples and she likes oranges. Disjunction: sentence with the word or in it (do not break up, only 1 premise: ex: ayesha likes apples or she likes oranges. Conditional: sentence with the form if, then: ex: if ayesha likes apples, then she likes oranges. Modus ponens/affirming the antecedent: if p then q. p therefore q, ex: if ayesha likes apples, then she likes oranges. Modus tollens/denying the consequent: if p then q. Not p: if ayesha likes apples, then she likes oranges. Therefore she does not like apples: valid. If q then r: if p then q, a=b b=c therefore, a=c, ex: if ayesha likes apples, then she likes oranges. If she likes apples, then she likes pears: valid. Disjunctive syllogism: p or q, ex: ayesha likes apples or she likes oranges. Therefore, she likes oranges: one has to be true.
