#18290: cardinality and is_finite methods for CartesianProduct
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.7
Component: categories | Resolution:
Keywords: cartesian_product | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/18290 | 7311911a110c5c3f0c30ab049dbaf66df7e080c7
Dependencies: | Stopgaps:
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Description changed by ncohen:
Old description:
> We implement two missing methods in
> `sage.sets.cartesian_product.CartesianProduct`: `is_finite`
> and `cardinality`.
New description:
We implement two missing methods in
`sage.sets.cartesian_product.CartesianProduct`: `is_finite`
and `cardinality`.
For example, the following was hanging
{{{
sage: F = Permutations(10)
sage: cartesian_product([ZZ, Set(), ZZ]).is_finite()
True
sage: cartesian_product([F, F]).is_finite()
True
sage: cartesian_product([F, F]).cardinality()
13168189440000
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/18290#comment:4>
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