#13253: galois_action on cusps has a bug and incorrect documentation
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Reporter: mderickx | Owner: craigcitro
Type: defect | Status: new
Priority: major | Milestone: sage-5.3
Component: modular forms | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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In #8998 there was some incorrect documentation added to
Cusp.galois_action . This ticket is to fix the documentation. It is also
to fix the following error, since in some cases the galois action is not
even a permutation. For example the following:
{{{
N=5
G=Gamma1(N)
for i in G.cusps():
print [j.galois_action(2,N).is_gamma1_equiv(i,N)[0] for j in
G.cusps()].count(True)
}}}
Outputs:
{{{
2
1
0
1
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13253>
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