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Ideas for 'Parmenides', 'Essence, Necessity and Explanation' and 'Understanding the Infinite'

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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

15934	Mathematical proof by contradiction needs the law of excluded middle [Lavine]
	Full Idea: The Law of Excluded Middle is (part of) the foundation of the mathematical practice of employing proofs by contradiction.
	From: Shaughan Lavine (Understanding the Infinite [1994], VI.1)
	A reaction: This applies in a lot of logic, as well as in mathematics. Come to think of it, it applies in Sudoku.