Hi Michael,

On 2019-03-11, Michael Beeson <profbee...@gmail.com> wrote:
> I tried various simplification functions.    I suppose I could start over, 
>  not using "symbolic expressions" but 
> declaring K to be a suitable field or ring, maybe a quadratic extension of 
> the field of rational functions in a. 
> That is probably the "right" way to do it.

Probably!

> But I wish there were a simpler way.

Why do you think using a sub-optimal far too general tool (e.g., symbolic
variables when in fact the problem is about polynomial) is "simpler"?

Best regards,
Simon

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