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Ideas for 'What is Logic?st1=Ian Hacking', 'Introduction to the Theory of Logic' and 'Facts and Propositions'

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2 ideas

5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models

10903

A structure models a sentence if it is true in the model, and a set of sentences if they are all true in the model [Zalabardo]

5. Theory of Logic / J. Model Theory in Logic / 3. Löwenheim-Skolem Theorems

13843

If it is a logic, the Löwenheim-Skolem theorem holds for it [Hacking]