#11875: Correct general brokenness of Farey symbols
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Reporter: davidloeffler | Owner: craigcitro
Type: defect | Status: new
Priority: blocker | Milestone: sage-4.7.2
Component: modular forms | Keywords: modular subgroup
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by davidloeffler):
It gets worse :-(
- For SL2Z, the code returns a malformed Farey symbol with too many
vertices (there are 2 rational vertices, so the side-pairing data should
be a list of length 3, but it has only 2 entries). This can be fixed by
removing the entry "1" from the Farey symbol.
- For the unique index 2 subgroup of PSL2Z (denoted by {{{Gamma_2}}} in
the article by Kurth and Long) this code returns the wrong Farey symbol
(corresponding to another completely different subgroup of index 6).
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11875#comment:2>
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