Combining Texts
Ideas for
'fragments/reports', 'Identity and Essence' and 'The Essence of Reference'
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5 ideas
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
8078
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Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
6023
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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / e. Empty names
10429
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It is best to say that a name designates iff there is something for it to designate [Sainsbury]
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5. Theory of Logic / F. Referring in Logic / 2. Descriptions / b. Definite descriptions
10425
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Definite descriptions may not be referring expressions, since they can fail to refer [Sainsbury]
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10438
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Definite descriptions are usually rigid in subject, but not in predicate, position [Sainsbury]
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