bug with conjugate in symbolic ring

[sagetrac-pierre]

this is wrong:

sage: z= I*sqrt(-3)
sage: z.conjugate()
-I*sqrt(-3)

Apply attachment: trac_10964-conjugate_doctest.patch

Depends on #11415

Upstream: Fixed upstream, in a later stable release.

CC: @kcrisman @burcin @jpflori @RBKreckel

Component: symbolics

Author: Richard Kreckel, Burcin Erocal

Reviewer: Karl-Dieter Crisman

Merged: sage-4.7.1.alpha4

Issue created by migration from https://trac.sagemath.org/ticket/10964

[kcrisman]

Upstream: Not yet reported upstream; Will do shortly.

[kcrisman]

Description changed:

--- 
+++ 
@@ -1,5 +1,7 @@
 this is wrong:
 
+```
 sage: z= I*sqrt(-3)
 sage: z.conjugate()
 -I*sqrt(-3)
+```

[kcrisman]

comment:1

This is probably followup to #8775. Certainly it is a Ginac issue, isn't it? (We'll eventually want to confirm this and report upstream.)

[kcrisman]

comment:2

This is probably followup to #8775.

Meaning that #8775 fixed the issue for basic functions, but apparently it doesn't propagate somehow to products.

[burcin]

comment:3

I sent an email about this to ginac-devel. It didn't show up yet, so I can't link to the thread. I can include a fix in the next pynac release if there is a fix in the next couple of days.

[burcin]

Changed upstream from Not yet reported upstream; Will do shortly. to None of the above - read trac for reasoning.

[kcrisman]

comment:4

Here is the beginning of the thread. No feedback so far.

[kcrisman]

Changed upstream from None of the above - read trac for reasoning. to Reported upstream. Little or no feedback.