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feat(algebraic_topology/simplex_category): epi and monos in the simpl…
…ex category (#8101) Characterize epimorphisms and monomorphisms in `simplex_category` in terms of the function they represent. Add lemmas about their behavior on length of objects. Co-authored-by: Robin Carlier <57142648+robin-carlier@users.noreply.github.com>
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