In experimenting with the Chor-Rivest knapsack cryptosystem, I have the
problem of adding two polynomials: one is the defining polynomial of the
field, and the other is a field element.

But the command

definingPolynomial()$F+u

produces the error

>> Error detected within library code:
  coerce: element doesn't belong to smaller field

which I don't understand.  What I need to do is to force u to be treated as
an "ordinary" polynomial, rather than as a field element...

-Alasdair
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