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Ideas for 'What is Logic?st1=Ian Hacking', 'Lectures 1930-32 (student notes)' and 'Beyond Good and Evil'

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4 ideas

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

13837

With a pure notion of truth and consequence, the meanings of connectives are fixed syntactically [Hacking]

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

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We may correctly use 'not' without making the rule explicit [Wittgenstein]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / d. and

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Saying 'and' has meaning is just saying it works in a sentence [Wittgenstein]

5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic

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Perhaps variables could be dispensed with, by arrows joining places in the scope of quantifiers [Hacking]