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Ideas for 'fragments/reports', 'Thinking About Logic' and 'Introduction to Mathematical Logic'

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3 ideas

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

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A 'model' of a theory specifies interpreting a language in a domain to make all theorems true [Walicki]

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

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Any first-order theory of sets is inadequate [Read]

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The L-S Theorem says no theory (even of reals) says more than a natural number theory [Walicki]