Bruce Lee's Thoughts on Reason

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Logic's central problem is the distinction between correct and incorrect argument.

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Logic deals ONLY with declarative sentences, i.e., sentences used for the purpose of making some claim or assertion about the world.

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Propositions are either true or false and can be either affirmed or denied.

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A valid argument is one in which all its premises are true and, hence, its conclusion is true.

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An invalid argument is one that is not valid because not all of its premises are true.

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An analytic proposition is a proposition which is necessarily true because its denial is self-contradictory (e.g., all barking dogs bark).

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A synthetic proposition is a proposition which is not self-contradictory and whose denial is not self-contradictory (e.g., all dogs bark).

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