#12588: abs(pi*I) should return pi
-------------------------------------+-------------------------------------
Reporter: dkrenn | Owner: burcin
Type: defect | Status: needs_info
Priority: major | Milestone: sage-6.8
Component: symbolics | Resolution:
Keywords: absolute value, | Merged in:
symbolic | Reviewers: Karl-Dieter Crisman
Authors: Ralf Stephan | Work issues:
Report Upstream: Fixed upstream, | Commit:
in a later stable release. | 33e868c92e7cb2627739d717b79ad21854033beb
Branch: | Stopgaps:
u/rws/abs_pi_i__should_return_pi |
Dependencies: #18537 |
-------------------------------------+-------------------------------------
Changes (by kcrisman):
* status: needs_review => needs_info
* reviewer: => Karl-Dieter Crisman
Comment:
I note that this doesn't change
{{{
sage: abs(i*x)
abs(I*x)
}}}
(see [https://groups.google.com/forum/#!topic/sage-devel/6j-LcC6tpkE this
long discussion] as to connections to derivatives). As long as that's
intentional, fine.
In the original [https://groups.google.com/forum/#!topic/sage-
support/KLvQSnja21c discussion leading to this ticket], we have this
example, which is still around.
{{{
sage: abs(log(2)*I)
abs(I*log(2))
sage: abs(log(2.)*I)
0.693147180559945
}}}
Again, just wondering if that is intentional, should be another ticket,
belongs here... etc. It seems to relate to whether something is a
"constant" or just in SR.
{{{
sage: abs(euler_gamma*I)
euler_gamma
sage: abs(5*I)
5
sage: abs(e^5*I)
abs(I*e^5)
}}}
I guess this would, in principle, belong to this ticket as well, though I
understand not wanting to hold up on #18537 since these are sort of
intertwined. I don't have any other objections to this, though.
--
Ticket URL: <http://trac.sagemath.org/ticket/12588#comment:17>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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