#17361: Poset: Add ordinal_product
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Reporter: | Owner:
jmantysalo | Status: needs_work
Type: | Milestone: sage-6.5
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers: Nathann Cohen
combinatorics | Work issues:
Keywords: poset | Commit:
Authors: | 56246c8f3abb1e66a2df1452f6016d8b288f37d7
Frédéric Chapoton | Stopgaps:
Report Upstream: N/A |
Branch: |
u/chapoton/17361 |
Dependencies: |
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Changes (by jmantysalo):
* status: needs_review => needs_work
Comment:
`Poset({0:[1,2]})` is a meet semilattice, but it's ordinal product with
itself is not a meet semilattice. (resp. for join semilattice). Hence we
have only two options: both arguments are lattices and so is return type
also lattice, or else return type is "only" poset.
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Ticket URL: <http://trac.sagemath.org/ticket/17361#comment:24>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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