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'', 'An Inquiry into Meaning and Truth' and 'Introduction to 'New Pragmatists''
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11 ideas
5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
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If a sound conclusion comes from two errors that cancel out, the path of the argument must matter [Rumfitt]
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5. Theory of Logic / A. Overview of Logic / 4. Pure Logic
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The physical world doesn't need logic, but the mental world does [Russell]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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Questions wouldn't lead anywhere without the law of excluded middle [Russell]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
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The sense of a connective comes from primitively obvious rules of inference [Rumfitt]
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11210
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Standardly 'and' and 'but' are held to have the same sense by having the same truth table [Rumfitt]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / e. or
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Disjunction may also arise in practice if there is imperfect memory. [Russell]
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16480
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A disjunction expresses indecision [Russell]
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16479
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'Or' expresses hesitation, in a dog at a crossroads, or birds risking grabbing crumbs [Russell]
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16481
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'Or' expresses a mental state, not something about the world [Russell]
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16487
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Maybe the 'or' used to describe mental states is not the 'or' of logic [Russell]
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5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / c. Grelling's paradox
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A 'heterological' predicate can't be predicated of itself; so is 'heterological' heterological? Yes=no! [Russell]
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