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Simplicial set group #35097

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merged 8 commits into from
Mar 19, 2023
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miguelmarco
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@miguelmarco miguelmarco commented Feb 12, 2023

📚 Implementation of finite covers of simplicial sets

Compute the cover of a (based) simplicial set associated to a representation of its fundamental group to a finite group.

Fixes #34886.

📝 Checklist

  • I have made sure that the title is self-explanatory and the description concisely explains the PR.
  • I have linked an issue or discussion.
  • I have created tests covering the changes.
  • I have updated the documentation accordingly.

⌛ Dependencies

@miguelmarco miguelmarco marked this pull request as draft February 12, 2023 19:55
@miguelmarco miguelmarco marked this pull request as ready for review February 12, 2023 20:04
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codecov-commenter commented Feb 12, 2023

Codecov Report

Patch coverage: 82.69% and project coverage change: +0.01 🎉

Comparison is base (c000c95) 88.60% compared to head (8a7729c) 88.62%.

Additional details and impacted files
@@             Coverage Diff             @@
##           develop   #35097      +/-   ##
===========================================
+ Coverage    88.60%   88.62%   +0.01%     
===========================================
  Files         2136     2148      +12     
  Lines       396142   398732    +2590     
===========================================
+ Hits        350990   353361    +2371     
- Misses       45152    45371     +219     
Impacted Files Coverage Δ
src/sage/topology/simplicial_set_catalog.py 100.00% <ø> (ø)
src/sage/topology/simplicial_set_examples.py 95.07% <63.33%> (-4.07%) ⬇️
src/sage/categories/simplicial_sets.py 92.09% <89.70%> (-1.02%) ⬇️
src/sage/topology/simplicial_set.py 95.67% <100.00%> (-0.08%) ⬇️

... and 159 files with indirect coverage changes

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def _universal_cover_dict(self):
r"""
Return the fundamental group and dictionary sending each edge to
the corresponding group element
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This method needs doctests.

(f * f * f, e): ((f * f, 1), s_0 (f, e), s_1 (f, e), (f * f, e))}
sage: C.fundamental_group()
Finitely presented group < | >

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I suggest deleting these two blank lines.

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@jhpalmieri jhpalmieri left a comment

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Overall it looks very good to me. I've suggested a few very minor changes, and one method needs doctests. Then it will be ready to go.

miguelmarco and others added 3 commits March 15, 2023 19:17
Co-authored-by: John H. Palmieri <jhpalmieri64@gmail.com>
Co-authored-by: John H. Palmieri <jhpalmieri64@gmail.com>
@miguelmarco
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Thanks for the review. I did the suggested changes.

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Looks great, thank you!

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Documentation preview for this PR is ready! 🎉
Built with commit: 8a7729c

@vbraun vbraun merged commit cc3da36 into sagemath:develop Mar 19, 2023
@mkoeppe mkoeppe added this to the sage-10.0 milestone Mar 19, 2023
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Implement finite covers of simplicial sets
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