#11709: FareySymbol
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Reporter: hmonien | Owner: craigcitro
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.7.2
Component: modular forms | Keywords: Farey symbol
Work_issues: | Upstream: N/A
Reviewer: Martin Raum | Author: Hartmut Monien
Merged: | Dependencies: None
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Comment(by mraum):
I have created a patch that incorporates the pictures. Btw. to create such
a patch simply type
{{{
hg add *.png
}}}
in the corresponding directory. Then commit. Don't be irritated by the v4.
I internally relabelled different versions of the patch, and I cannot
overwrite your uploads.
I have changed some lines where you have put your name twice in the author
section. It is common in Sage to put a list there, to provide the
possibility to include further authors, which later might contribute.
The one thing that is irritating is the SL2Z case. Obviously, PSL is not a
subgroup of SL, so it does not make sense to talk about indices. Also the
index of SL2 in SL2, as a matter of fact, is 1. In the current
implemntation generators() equals cosets(), which cannot be right.
Am I missing anything, that you intent to implement?
Since you know provide the SL2 generators explicitly, I wonder why you
don't use [[0,1],[-1,0]] and [[1,1],[0,1]], which are the most common used
generators. Clearly, your choice is perfectly possible; I just wonder.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11709#comment:13>
Sage <http://www.sagemath.org>
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