#18597: Implement m-Cambrian lattices (using delta sequences)
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Reporter: nathanwilliams | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.8
Component: combinatorics | Resolution:
Keywords: | Merged in:
sagedays64.5,catalan,coxeter,cambrian| Reviewers: Christian Stump
Authors: Nathan Williams | Work issues:
Report Upstream: N/A | Commit:
Branch: | 49aab49c1afb45314bc444114c8385bc557d5ab5
u/stumpc5/implement_m_cambrian_lattices__using_delta_sequences_| Stopgaps:
Dependencies: |
#18590,#18610,#11187 |
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Comment (by chapoton):
Here is the core of the problem:
{{{
sage: m0=matrix(UniversalCyclotomicField(),2,2,[-1,-1,0,1],sparse=True)
sage: m1=matrix(UniversalCyclotomicField(),2,2,[-1,-1,0,1],sparse=False)
sage: m0.set_immutable()
sage: m1.set_immutable()
sage: hash(m0)
6264216653211852203
sage: hash(m1)
3594435451553950751
sage: m0==m1
True
}}}
No problem when using ZZ or QQ instead of UCF though..
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Ticket URL: <http://trac.sagemath.org/ticket/18597#comment:24>
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