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4 ideas
11210 | Standardly 'and' and 'but' are held to have the same sense by having the same truth table [Rumfitt] |
13837 | With a pure notion of truth and consequence, the meanings of connectives are fixed syntactically [Hacking] |
11212 | The sense of a connective comes from primitively obvious rules of inference [Rumfitt] |
13839 | Perhaps variables could be dispensed with, by arrows joining places in the scope of quantifiers [Hacking] |