#19318: Implement inverse_of_unit for IntegerModRing
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Reporter: bruno | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.9
Component: finite rings | Keywords:
Merged in: | Authors: Bruno Grenet
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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This (small) patch allows one to compute the inverse of a unit in an
`IntegerModRing`. It provides the following functionality:
{{{#!python
sage: R = IntegerModRing(10)
sage: R(7).inverse_of_unit()
3
sage: R(4).inverse_of_unit() # 4 is not a unit in ZZ/10ZZ
Traceback (most recent call last):
...
ZeroDivisionError: Inverse does not exist.
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/19318>
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