#13253: galois_action on cusps has a bug and incorrect documentation
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Reporter: mderickx | Owner: craigcitro
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.3
Component: modular forms | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Marco Streng
Authors: Maarten Derickx | Merged in:
Dependencies: | Stopgaps:
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Changes (by mderickx):
* status: needs_work => needs_review
Comment:
I think I incorporated all your comments.
I also made a slight change to the NOTE:: section since it was
mathematically incorrect. Parametrizing all $\mu_N \times \ZZ/N\ZZ$
embeddings gives you reducible scheme that consists of euler_phi(N)
isomorphic copies. The quotient of the upper halve plane by Gamma(N)
however just gives one of these copies. The new version fixes this.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13253#comment:6>
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