Inconsistency with 0^0

[kcrisman]

See this ask.sagemath question. Apparently Ginac says zero to the zero is undefined but most of the rest of Sage (in accordance with IEEE) says it is one:

sage: ZZ(0)^ZZ(0)
1

but

sage: SR(0)^SR(0)
ValueError: power::eval(): pow(0,0) is undefined

Issue at pynac/pynac#20

Depends on #18362

Upstream: Fixed upstream, in a later stable release.

Component: symbolics

Keywords: pynac

Author: Ralf Stephan

Branch/Commit: 4df15dd

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/18088

[sagetrac-tmonteil]

Description changed:

--- 
+++ 
@@ -1 +1,14 @@
-See [this ask.sagemath question](http://ask.sagemath.org/question/26374/evaluation-fail/).  Apparently Ginac says zero to the zero is undefined but most of the rest of Sage (in accordance with IEEE) says it is one.
+See [this ask.sagemath question](http://ask.sagemath.org/question/26374/evaluation-fail/).  Apparently Ginac says zero to the zero is undefined but most of the rest of Sage (in accordance with IEEE) says it is one:
+
+```
+sage: ZZ(0)^ZZ(0)
+1
+```
+
+but
+
+```
+sage: SR(0)^SR(0)
+ValueError: power::eval(): pow(0,0) is undefined
+```
+

[rwst]

Changed keywords from none to pynac

[rwst]

Description changed:

--- 
+++ 
@@ -12,3 +12,4 @@
 ValueError: power::eval(): pow(0,0) is undefined
 ```
 
+Issue at https://github.com/pynac/pynac/issues/20

[rwst]

Upstream: Reported upstream. Developers acknowledge bug.

[rwst]

Branch: u/rws/inconsistency_with_0_0

[rwst]

New commits:

4df15dd

18088: doctest for fix of pynac issue 20

[rwst]

Commit: 4df15dd