Combining Texts

Ideas for 'fragments/reports', 'Nietzsche's System' and 'Problems of Philosophy'

expand these ideas     |    start again     |     choose another area for these texts

display all the ideas for this combination of texts

---

5 ideas

5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens

8078	Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]

5395	Demonstration always relies on the rule that anything implied by a truth is true [Russell]

5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

6023	Every proposition is either true or false [Chrysippus, by Cicero]

5. Theory of Logic / F. Referring in Logic / 1. Naming / b. Names as descriptive

5386	Proper names are really descriptions, and can be replaced by a description in a person's mind [Russell]

5. Theory of Logic / F. Referring in Logic / 2. Descriptions / b. Definite descriptions

5385	The phrase 'a so-and-so' is an 'ambiguous' description'; 'the so-and-so' (singular) is a 'definite' description [Russell]