#15322: Testing for antichains and chains in arbitrary posets
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Reporter: darij | Owner:
Type: | Status: new
enhancement | Milestone: sage-5.13
Priority: major | Keywords: posets, combinat, categories
Component: | Authors: Darij Grinberg
combinatorics | Report Upstream: N/A
Merged in: | Branch:
Reviewers: | Dependencies: #15283
Work issues: |
Commit: |
Stopgaps: |
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`sage/combinat/posets.py` currently has an `is_chain` method testing
whether a poset is a chain, but there is no method to test if a subset of
a poset is a chain; moreover, no comparable functionality for antichains
exists. The present patch implements this functionality. Chain testing is
implemented twice, once for finite and once for arbitrary posets.
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Ticket URL: <http://trac.sagemath.org/ticket/15322>
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