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Laws of Thought
ilovesuica
Jul 20, 2020
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Laws of Thought
The Law of Contradiction
For all propositions p, it is impossible for both p and not p to be true.
The Law of Excluded Middle
Either p or ∼p must be true, there being no third or middle true proposition between them.
The Principle of Identity
If a propositional function F is true of an individual variable x, then F is true of x.
A thing is identical with itself, simply that x is x.
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