PHIL-125 Lecture Notes - Lecture 3: Hypothetical Syllogism, Modus Ponens, Deductive Reasoning
17 Jan 2020
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Including physics, chemistry, astronomy and logic itself is based on deductive reasoning. Arguments whom depend on the theories drawing on these subjects, then these arguments are deductive: hypothetical syllogisms: an argument where at least one premise (could be more) is a conditional statement. All such arguments will be seen as deductive. Example: "if you love me, then you must marry me. " Modus ponens: for the form that stands behind the above argument. Example: "if you drink and drive, then you"re an idiot. If you are an idiot, then you are a reckless moron. " Conclusion: if you drink and drive, you"re a reckless moron. This argument is a pure hypothetical syllogism: disjunctive syllogism: a premise is a disjunctive statement. A disjunctive statement is an instance of a form either a) or b). Where a) and b) are to be replaced with statements. "either you live in edmonton or you live in calgary. " These are the only two places you can live.
