#19555: Implement a containment for cartesian_product
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Reporter: tscrim | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.10
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: Travis Scrimshaw | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
public/sets/contains_cartesian_product-19555|
7466511b9ba67f2d6b8985fa0f4c641fb9e58978
Dependencies: | Stopgaps:
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Changes (by tscrim):
* status: needs_info => needs_review
Comment:
Replying to [comment:6 vdelecroix]:
> 1. What is the rationale for having tuple being considered as elements
of the cartesian product?
They are just wrappers around tuples, and at times, it is beneficial to
not wrap/unwrap such objects, such as if the Cartesian product is the set
of keys of a dict/Family.
> 2. With this version `__contains__` and `Element.__eq__` are not
compatible
> {{{
> sage: (1,1) in C
> True
> sage: any(x == (1,1) for x in C)
> False
> }}}
Good point. I added equality of tuples.
--
Ticket URL: <http://trac.sagemath.org/ticket/19555#comment:8>
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