Combining Texts

Ideas for 'On the Question of Absolute Undecidability', 'First-order Logic, 2nd-order, Completeness' and 'First-Order Logic'

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4 ideas

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

10756

A model is a domain, and an interpretation assigning objects, predicates, relations etc. [Rossberg]

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

10758

If models of a mathematical theory are all isomorphic, it is 'categorical', with essentially one model [Rossberg]

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

10288

Down Löwenheim-Skolem: if a countable language has a consistent theory, that has a countable model [Hodges,W]

10289

Up Löwenheim-Skolem: if infinite models, then arbitrarily large models [Hodges,W]