SSH 105 Lecture Notes - Modus Ponens
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21 Oct 2012
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There are some common patterns shared by many deductive arguments. They form a frame that is common to many arguments. Understanding some basic argument patterns help to determine (a) whether an argument is deductive (b) whether is it valid or invalid. Many of these patterns involve two kids of statements. A conditional statement is a statement of the form. If it rains, then the picnic will be cancelled. If jones didn"t commit the murder, the butler did. Conditionals are compound statements composed of two parts: The antecendent what follows the word if . The consequent what follows the word then . The antecendent always a expresses a sufficient condition for the consequent. The consequent expresses a necessary condition (not on quiz two) A disjunctive statement is a statement of the form. Examples either the picnic was cancelled or it rained. Either jones commited the murder or the butler didi. Disjunctions are compound statements composed of two parts called the disjuncts.
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