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Ideas for '', 'Recent Aesthetics in England and America' and 'Problems of Philosophy'

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6 ideas

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic

11211

If a sound conclusion comes from two errors that cancel out, the path of the argument must matter [Rumfitt]

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

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

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

11212

The sense of a connective comes from primitively obvious rules of inference [Rumfitt]

11210

Standardly 'and' and 'but' are held to have the same sense by having the same truth table [Rumfitt]

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]