#14789: Implement hyperplane arrangements
-------------------------------------+-------------------------------------
Reporter: kcrisman | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.13
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: dperkinson, | Reviewers:
vbraun | Work issues:
Report Upstream: N/A | Commit:
Branch: | 42b1aa531d73ec9fe94f5acd7c50ad885164aeb5
u/vbraun/hyperplane_arrangements | Stopgaps:
Dependencies: |
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Comment (by darij):
The thing I was beefing about with my `sign_vector` copypasta wasn't so
much the handling of `==` (which would require us to fix the definition of
a hyperplane arrangement in place more formally than mathematicians do),
as the relative uselessness of the input:
{{{
sage: h = H(x, y, x-1, y-1, y-1)
sage: h.sign_vector((2,-2))
(-1, -1, 1, 1)
sage: h.restriction(y).sign_vector((2,))
(-1, 1)
}}}
How do I tell (without lots of overhead) which entry of the vector
corresponds to which line?
--
Ticket URL: <http://trac.sagemath.org/ticket/14789#comment:52>
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