#5244: is_unit is mostly not implemented for symbolic ring.
---------------------+------------------------------------------------------
Reporter: hivert | Owner: hivert
Type: defect | Status: new
Priority: major | Milestone:
Component: algebra | Keywords: is_unit, symbolic ring
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Here is the code of is_unit for symbolic rings (it is actually iherited
from Ring):
{{{
def is_unit(self):
if self == 1 or self == -1:
return True
raise NotImplementedError
}}}
On can do better !!!
As a result
{{{
sage: m=matrix(SR, 2,2)
sage: m.is_invertible()
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call
last)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5244>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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