#4762: [with patch, needs review] Odd error message for congruence subgroups
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Reporter: ljpk | Owner: craigcitro
Type: defect | Status: new
Priority: minor | Milestone: sage-3.2.2
Component: modular forms | Resolution:
Keywords: |
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Changes (by AlexGhitza):
* summary: Odd error message for congruence subgroups => [with patch,
needs review] Odd error message for congruence
subgroups
Comment:
This is due to two underlying problems:
* coercing an element of a congruence subgroup into the set of 2x2
integer matrices is broken
* if g is an element of a congruence subgroup, testing g == 0 is broken
The attached patch fixes both issues. Note that if !CongruenceSubgroup
were to inherit from !MatrixGroup (which it probably should?), then the
first problem would just go away.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4762#comment:2>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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