Löwenheim-Skolem theorem

English

Etymology

Named for Leopold Löwenheim and Thoralf Skolem.

Proper noun

Löwenheim-Skolem theorem

  1. (mathematical logic) A theorem stating that, if a countable first-order theory has an infinite model, then for every infinite cardinal number κ it has a model of size κ. The result implies that first-order theories are unable to control the cardinality of their infinite models, and that no first-order theory with an infinite model can have a unique model up to isomorphism.
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