Combining Texts
Ideas for
'Parmenides', 'Conditionals' and 'An Inquiry into Meaning and Truth'
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11 ideas
5. Theory of Logic / A. Overview of Logic / 4. Pure Logic
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16486
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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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2947
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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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14352
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'¬', '&', and 'v' are truth functions: the truth of the compound is fixed by the truth of the components [Jackson]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / e. or
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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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16483
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Disjunction may also arise in practice if there is imperfect memory. [Russell]
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5. Theory of Logic / L. Paradox / 3. Antinomies
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13986
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Plato found antinomies in ideas, Kant in space and time, and Bradley in relations [Plato, by Ryle]
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14150
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Plato's 'Parmenides' is perhaps the best collection of antinomies ever made [Russell on Plato]
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5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / c. Grelling's paradox
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16475
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A 'heterological' predicate can't be predicated of itself; so is 'heterological' heterological? Yes=no! [Russell]
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