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Ideas for 'fragments/reports', 'Philosophies of Mathematics' and 'Animal Rights and Wrongs'

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

10129

A 'model' is a meaning-assignment which makes all the axioms true [George/Velleman]

5. Theory of Logic / J. Model Theory in Logic / 2. Isomorphisms

10105

Differences between isomorphic structures seem unimportant [George/Velleman]