D.7.5.10 InvertNumberMain
.........................
Procedure from library zeroset.lib (see zeroset_lib).

Usage:
InvertNumberMain(f); where f is a polynomial

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 !


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