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user 24563
3
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About small $\omega$-orthogonality classes and Gabriel-Ulmer duality
I understand where is the mistake. $r$ does preserve finite presentability (the proof is straightforward and it is due to the fact that it is a left adjoint of a functor preserving filtered colimits). …
- 3,901
8
votes
What was Burroni's sketch for topological spaces?
The category of topological spaces is the category of models of a relational universal strict Horn theory $T$ without equality, i.e. the axioms are of the form $(\forall x)(\phi(x) \rightarrow \psi(x) …
- 3,901