Combining Philosophers
Ideas for Rescher,N/Oppenheim,P, Walter Burley and Bertrand Russell
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21 ideas
5. Theory of Logic / E. Structures of Logic / 1. Logical Form
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7758
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'Elizabeth = Queen of England' is really a predication, not an identity-statement [Russell, by Lycan]
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6092
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In a logically perfect language, there will be just one word for every simple object [Russell]
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6101
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Romulus does not occur in the proposition 'Romulus did not exist' [Russell]
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6115
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Vagueness, and simples being beyond experience, are obstacles to a logical language [Russell]
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7528
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Leibniz bases everything on subject/predicate and substance/property propositions [Russell]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
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23476
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Logical constants seem to be entities in propositions, but are actually pure form [Russell]
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23477
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We use logical notions, so they must be objects - but I don't know what they really are [Russell]
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21586
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The logical connectives are not objects, but are formal, and need a context [Russell]
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21597
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Logical connectives have the highest precision, yet are infected by the vagueness of true and false [Russell, by Williamson]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / b. Basic connectives
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14105
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There seem to be eight or nine logical constants [Russell]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not
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18722
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Negations are not just reversals of truth-value, since that can happen without negation [Wittgenstein on Russell]
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16489
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Is it possible to state every possible truth about the whole course of nature without using 'not'? [Russell]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / e. or
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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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16480
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A disjunction expresses indecision [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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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 / E. Structures of Logic / 3. Constants in Logic
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14104
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Constants are absolutely definite and unambiguous [Russell]
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5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic
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14114
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Variables don't stand alone, but exist as parts of propositional functions [Russell]
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5772
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The idea of a variable is fundamental [Russell]
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5. Theory of Logic / E. Structures of Logic / 5. Functions in Logic
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21566
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'Propositional functions' are ambiguous until the variable is given a value [Russell]
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