#15846: Incorrect series expansion of zeta(s) at 1
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Reporter: mmezzarobba | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by behackl):
Well, although there definitely is that problem in !SymPy, the erronous
expansion in sage seems to originate from Ginac:
{{{
behackl@Jethro ~ $ ginac
ginsh - GiNaC Interactive Shell (GiNaC V1.6.3)
__, _______ Copyright (C) 1999-2014 Johannes Gutenberg University
Mainz,
(__) * | Germany. This is free software with ABSOLUTELY NO
WARRANTY.
._) i N a C | You are welcome to redistribute it under certain
conditions.
<-------------' For details type `warranty;'.
Type ?? for a list of help topics.
> series(zeta(x+1), x, 2);
(zeta(1))+(zetaderiv(1,1))*x+Order(x^2)
}}}
This is exactly the output as in sage itself.
The zeta function does not seem to be very popular in that matter. ;-)
--
Ticket URL: <http://trac.sagemath.org/ticket/15846#comment:4>
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