Ralf wrote:
Obviously, for the result, it wouldn't matter.

Well, maybe obvious for you ... in absence of documentation and without reading 
the code I can imagine at least 3 ways of coercing  x^10 + y -1 to a 
SparseUnivariatePolynomial(Exprression(Integer)):

Calling ? the variable,

(x^10+ y -1)*(?^0)

OR

(?^10) + (y-1)*(?^0)

OR

(?^1)+ (x^10-1)*(?^0)

ric

PS now I know it is the first one...

(6) -> sup

             10
   (6)  y + x   - 1
                        Type: SparseUnivariatePolynomial(Expression(Integer))
(7) -> coefficients sup

              10
   (7)  [y + x   - 1]
                                              Type: List(Expression(Integer))

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