Opened 10 months ago
Closed 9 months ago
#30401 closed defect (fixed)
Unions of subsets of a fixed open set X are not known to be subsets of X
Reported by: | tscrim | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-9.2 |
Component: | manifolds | Keywords: | |
Cc: | egourgoulhon, gh-mjungmath | Merged in: | |
Authors: | Eric Gourgoulhon | Reviewers: | Travis Scrimshaw |
Report Upstream: | N/A | Work issues: | |
Branch: | bbe5d11 (Commits, GitHub, GitLab) | Commit: | bbe5d11bb921f2ff0e2091d95fe304aaea472dee |
Dependencies: | Stopgaps: |
Description
See the following:
sage: T = Manifold(2, 'T', start_index=1) sage: U0 = T.open_subset("U0", latex_name="U_0") sage: Uh = T.open_subset("Uh", latex_name="U_h") sage: T.declare_union(U0, Uh) sage: I0h = U0.intersection(Uh, name="I0h", latex_name="I_{0h}") sage: X1 = I0h.open_subset('X1', "X_1") sage: X2 = I0h.open_subset('X2', "X_2") sage: X3 = I0h.open_subset('X3', "X_3") sage: X1.union(X2).is_subset(I0h) False
This means I cannot declare I0h
as the union of 3 subsets.
Change History (5)
comment:1 Changed 10 months ago by
- Branch set to public/manifolds/union_subsets_30401
- Commit set to bbe5d11bb921f2ff0e2091d95fe304aaea472dee
comment:2 Changed 10 months ago by
- Status changed from new to needs_review
comment:3 Changed 10 months ago by
- Reviewers set to Travis Scrimshaw
- Status changed from needs_review to positive_review
Thank you.
comment:4 Changed 10 months ago by
Thanks for having reported the bug and performed the review.
comment:5 Changed 9 months ago by
- Branch changed from public/manifolds/union_subsets_30401 to bbe5d11bb921f2ff0e2091d95fe304aaea472dee
- Resolution set to fixed
- Status changed from positive_review to closed
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New commits:
Fix bug in union of manifold subsets (Trac #30401)