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Ideas for 'Thinking About Mathematics', 'Explanation and Reference' and 'Intro to 2nd ed of Principia Mathematica'

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2 ideas

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

8729	Intuitionists deny excluded middle, because it is committed to transcendent truth or objects [Shapiro]

5. Theory of Logic / F. Referring in Logic / 1. Naming / a. Names

17505

Using proper names properly doesn't involve necessary and sufficient conditions [Putnam]