Ok. '_populate_coercion_lists_ ' solve my problem.
Thanks, Robert!
Kwankyu
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On Jul 1, 2009, at 1:22 AM, Kwankyu wrote:
> Hi,
>
> I am trying to understand the coercion model...
>
> In the followiing, C is a parent that I defined, in which (I think) I
> implemented a coercion map from P to C, but not from ZZ to C.
>
> sage: P
> Multivariate Polynomial Ring in x, y over Fi
