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This page is for material relevant to my Ph.D. thesis — I will try to sketch the important bits here as I write up the document itself.
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There are two quite different ways to construct the effective topos: we start with the Kleene algebra of partial recursive functions, and then
construct the effective tripos,
and then take its category of partial equivalence relations; or
construct the regular category of assemblies over
and take its exact completion.
We show how the two are related.