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`desing/inverse`

Computing the inverse of an invertible element in a ring.

Input:
 
f
a polynomial from k[S] (a representative of an element of k[S]/<DEP>),
DEP
a list of polynomials from k[S],
S
a list of variables.
Output:
a polynomial from k[S], the inverse of f in k[S]/<DEP>.

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