>
> GF(4) is not a subfield of GF(8).
>
Oh. Right. Actually, the problem with my code happened when both finite
fields were equal, and I wrote this message without thinking.
sage: K1 = GF(8,'a')
sage: K2 = GF(8,'b')
sage: K2(K1(1))
TypeError: unable to coerce from a finite field other than the prime
subfield
Perhaps it is then easier to solve.
Nathann
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