| #### D.8.10.8 invertNumberMain Procedure from library `zeroset.lib` (see zeroset_lib). Usage: invertNumberMain(f); where f is a polynomial in Q[a] Purpose: compute 1/f if f is a number in Q(a), i.e., f is represented by a polynomial in Q[a]. Return: poly 1/f Assume: basering = Q[x_1,...,x_n,a], ideal mpoly must be defined and != 0 ! Note: outdated, use / instead

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