#8541: modular forms / linear algebra issue -- subspace not invariant
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Reporter: was | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-4.4
Component: linear algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by davidloeffler):
Hold it, my suspicion was wrong: the height method only gets called after
clearing denominators, and the problem is still there if we use the
integral matrix {{{n = matrix(K, [125, -6*zeta4 - 117])}}}. So maybe the
problem is here:
{{{
# conservative but correct estimate
bound = A.height() * B.height() * self._ncols
}}}
Perhaps this estimate is wrong in this degenerate case?
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8541#comment:3>
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