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arxiv: 1012.3185 · v1 · pith:V2UEQ3ELnew · submitted 2010-12-14 · 🧮 math.LO · math.CT

A categorical approach to internality

classification 🧮 math.LO math.CT
keywords categoricalinternalitymodeldefinablegrouptheoreticanalogousanalogue
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Model theoretic internality provides conditions under which the group of automorphisms of a model over a reduct is itself a definable group. In this paper we formulate a categorical analogue of the condition of internality, and prove an analogous result on the categorical level. The model theoretic statement is recovered by considering the category of definable sets.

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