#19113: LatticePoset: Return type category of product()
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Reporter: jmantysalo | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.9
Component: combinatorics | Resolution:
Keywords: poset, latticeposet | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by jmantysalo):
* cc: nthiery (added)
Comment:
Nicolas, you might be interested in this. `type(L2)` says
`sage.combinat.posets.lattices.FiniteLatticePoset_with_category` but
`L2.category()` gives Join of Category of finite ''posets'' and Category
of finite enumerated sets and Category of facade sets, whereas the
category of `L3` is Join of Category of finite ''lattice'' posets and
Category of finite enumerated sets and Category of facade sets.
I don't know if there is anything to do to prevent this kind of errors.
The error appears with `L2.join_irreducibles()`, but `L2.join_matrix()`
works.
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Ticket URL: <http://trac.sagemath.org/ticket/19113#comment:2>
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