#19312: Update to pynac-0.5.0
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Reporter: rws | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.10
Component: packages: | Resolution:
standard | Merged in:
Keywords: | Reviewers:
Authors: Ralf Stephan | Work issues:
Report Upstream: N/A | Commit:
Branch: u/rws/19312-2 | 76733e4c003da3506ac1cc15bea61b7ca147de93
Dependencies: #19606 | Stopgaps:
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Comment (by tscrim):
Replying to [comment:42 rws]:
> Replying to [comment:37 tscrim]:
> > - I don't understand this change:
> > @@ -1054,12 +1054,11 @@ def mobius_transform(A, z):
> > I feel it obfuscates what the Möbius transform does.
> Well you can't give a transform of a noninvertible matrix, so I changed
the example to one that is always invertible. I can revert to the original
doctest but it will lead to problems in a later ticket.
Unless `a*d - b*c == 0`, then this is an invertible matrix, and this is a
"rare" event for generic `a,b,c,d`. So I would say this is a safe test, or
perhaps we can add an assumption that `a*d - b*c != 0`? Also could you
tell me what ticket you are referring to or give some more details?
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Ticket URL: <http://trac.sagemath.org/ticket/19312#comment:44>
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