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Ideas for 'Lectures 1930-32 (student notes)', 'Philosophy of Mathematics' and 'Phil of Mathematics: why nothing works'

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2 ideas

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not

18723	We may correctly use 'not' without making the rule explicit [Wittgenstein]
	Full Idea: Correct use does not imply the ability to make the rules explicit. Understanding 'not' is like understanding a move in chess.
	From: Ludwig Wittgenstein (Lectures 1930-32 (student notes) [1931], B XII.1)

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / d. and

18718	Saying 'and' has meaning is just saying it works in a sentence [Wittgenstein]
	Full Idea: When we say that the word 'and' has meaning what we mean is that it works in a sentence and is not just a flourish.
	From: Ludwig Wittgenstein (Lectures 1930-32 (student notes) [1931], B VIII.2)