PHL100Y1 Lecture Notes - Lecture 3: Lewis Carroll, Ontario Health Insurance Plan, If And Only If

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11 Dec 2017
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Arguments1: let us begin by distinguishing necessary and sufficient conditions: A proposition p is a sufficient condition for a proposition q when p"s being true is all by itself enough for q to be true: example: that fido is a dog is sufficient for his being a mammal. A proposition p is a necessary condition for a proposition q when q cannot be true without p"s also being true: example: that jim is from texas is necessary for his being from dallas. Q (or as it is sometimes abbreviated, p iff q ) means that p and q are each necessary and sufficient for each other hence, that they are logically equivalent: an argument is a list of propositions. The premises of an argument are intended to support that is, to providence evidence for or reasons to believe the conclusion.

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