#17569: Allow creating finite fields without a variable name
-------------------------------------+-------------------------------------
Reporter: pbruin | Owner:
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-7.1
Component: finite rings | Resolution:
Keywords: | Merged in:
Authors: David Roe | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/roed/allow_creating_finite_fields_without_a_variable_name|
2fcbc08667d7048d1f9a2691c8e4e9a2eff66001
Dependencies: | Stopgaps:
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Comment (by ncohen):
Replying to [comment:9 roed]:
> Currently, you can feed random keyword arguments to most (all?) of the
finite field constructors and they'll have no effect.
These useless-but-accepted arguments are a plague. There was a wealth of
them in many 'plot' functions at a time: you tried to give a color to
something, the argument 'color="red"' was accepted but nothing happened.
The most common way in which they are a pain are typos:
{{{
sage: GF(16,'x',checkirreducible=True)
Finite Field in x of size 2^4
}}}
The side-effect of not having a '_' in `check_irreducible` is that... It
is ignored. And of course no exception to tell you.
About having an effect, here is one (thanks to `UniqueRepresentation`, I
expect)
{{{
sage: GF(27,'a') == GF(27,'a')
True
sage: GF(27,'a',whatever=158) == GF(27,'a')
False
sage: GF(27,'a')(1) + GF(27,'a')(1)
2
sage: GF(27,'a',whatever=158)(1) + GF(27,'a')(1)
TypeError: unsupported operand parent(s) for '+': 'Finite Field in a of
size 3^3' and 'Finite Field in a of size 3^3'
}}}
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/17569#comment:11>
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