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Ideas for 'What is Logic?st1=Ian Hacking', 'The Principles of Chemistry' and 'Axiomatic Theories of Truth'

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3 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 / 4. Variables in Logic

13839

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

5. Theory of Logic / E. Structures of Logic / 8. Theories in Logic

16310

A theory is some formulae and all of their consequences [Halbach]