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7 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 / A. Overview of Logic / 2. History of Logic

18912

Was logic a branch of mathematics, or mathematics a branch of logic? [Engelbretsen]

5. Theory of Logic / E. Structures of Logic / 1. Logical Form

18922

Logical syntax is actually close to surface linguistic form [Engelbretsen]

18905

Propositions can be analysed as pairs of terms glued together by predication [Engelbretsen]

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 / E. Structures of Logic / 2. Logical Connectives / c. not

18908

Standard logic only negates sentences, even via negated general terms or predicates [Engelbretsen]