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All the ideas for '', 'What is an Idea?' and 'There are no ordinary things'

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7 ideas

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
11211 If a sound conclusion comes from two errors that cancel out, the path of the argument must matter [Rumfitt]
5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
11210 Standardly 'and' and 'but' are held to have the same sense by having the same truth table [Rumfitt]
11212 The sense of a connective comes from primitively obvious rules of inference [Rumfitt]
7. Existence / D. Theories of Reality / 10. Vagueness / d. Vagueness as linguistic
9052 Vague predicates lack application; there are no borderline cases; vague F is not F [Unger, by Keefe/Smith]
9. Objects / A. Existence of Objects / 5. Simples
16070 There are no objects with proper parts; there are only mereological simples [Unger, by Wasserman]
18. Thought / C. Content / 2. Ideas
19423 By an 'idea' I mean not an actual thought, but the resources we can draw on to think [Leibniz]
19. Language / F. Communication / 3. Denial
11214 We learn 'not' along with affirmation, by learning to either affirm or deny a sentence [Rumfitt]