Yes, I see. (And of course I meant "R in Fields()" and "except
AttributeError".)
Does anybody open a ticket about this issue? I'd like to follow.
Off-Topic question: Is Sage capable of checking *whether *a multivariable
(differentiable) function has a zero in a given domain?
Best,
Michael
Am Samstag, 13. Juli 2019 14:23:31 UTC+2 schrieb Simon King:
>
> Hi Michael,
>
> On 2019-07-13, Michael Jung <mic...@uni-potsdam.de <javascript:>> wrote:
> > You could try something like
> > try:
> > is_field = R.is_field()
> > except TypeError:
> > is_field = (R in Rings())
> > as a compromise? Would that make the code faster?
>
> I think today the preferred way to test if something is a ring or
> integral domain or field is via categories ("R in Fields()").
>
> Best regards,
> Simon
>
>
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