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automatic simplification can lose some infinities #13587

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burcin opened this issue Oct 8, 2012 · 9 comments
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automatic simplification can lose some infinities #13587

burcin opened this issue Oct 8, 2012 · 9 comments
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c: symbolics p: critical / 2 t: bug
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sage-5.9

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@burcin
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burcin commented Oct 8, 2012

From this ask.sagemath.org question:

sage: t = tan(x)^2 - tan(x)    
sage: t.subs(x=pi/2)
0
sage: u = gamma(x) - gamma(x-1)
sage: u.subs(x=-1)
0

Depends on #13729

CC: @kcrisman

Component: symbolics

Keywords: pynac arithmetic

Author: Burcin Erocal

Reviewer: Jean-Pierre Flori

Merged: sage-5.9.beta1

Issue created by migration from https://trac.sagemath.org/ticket/13587
@burcin burcin added this to the sage-5.5 milestone Oct 8, 2012
@burcin burcin self-assigned this Oct 8, 2012
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burcin commented Nov 19, 2012

Attachment: trac_13587-infinity_doctest.patch.gz

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burcin commented Nov 19, 2012

comment:2

This is now Pynac issue #14. It will be fixed in the next Pynac release.

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burcin commented Nov 20, 2012

Changed keywords from pynac to pynac arithmetic

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burcin commented Nov 20, 2012

comment:3

Pynac 0.2.6 contains a fix for this. Updating the spkg is #13729.

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burcin commented Nov 20, 2012

Author: Burcin Erocal

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burcin commented Nov 20, 2012

Dependencies: #13729

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jpflori commented Nov 21, 2012

Reviewer: Jean-Pierre Flori

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jpflori commented Nov 21, 2012

comment:4

The added doctest tests what it should and passes with updated Pynac, so positive review.

@jdemeyer jdemeyer removed this from the sage-5.5 milestone Nov 27, 2012
@jdemeyer jdemeyer added this to the sage-5.9 milestone Mar 14, 2013
@jdemeyer jdemeyer removed the pending label Mar 14, 2013
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Merged: sage-5.9.beta1

This was referenced Nov 21, 2012
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