#14541: Family over enumerated set has wrong category
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Reporter: cnassau | Owner:
nthiery
Type: defect | Status:
new
Priority: minor | Milestone:
sage-5.10
Component: categories | Resolution:
Keywords: Family, Category of finite enumerated sets | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by cnassau):
The attached patch changes the category initialization of {{{LazyFamily}}}
objects: if the keys {{{K}}} are an instance of {{{CombinatorialClass}}}
the category choice now depends on "{{{K.cardinality() < Infinity}}}" in
the obvious way.
(I have not tried to inspect the keys {{{K}}} further, because I could not
find a {{{CombinatorialClass}}} without custom {{{cardinality}}} method.)
I have also added another exception to {{{LazyFamily.cardinality()}}}: the
code used to check for {{{AttributeError}}} and {{{NotImplementedError}}},
but {{{CartesianProduct(...).__len__}}} raises a {{{TypeError}}} instead.
I've added a doctest that fails otherwise.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14541#comment:4>
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