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D.8.6.6 egcdMain

Procedure from library zeroset.lib (see zeroset_lib).

Usage:
egcdMain(f, g); where f,g are polynomials

Purpose:
compute the polynomial gcd of f and g over Q(a)[x]

Return:
poly

Assume:
basering = Q[x,a] and ideal mpoly is defined (it might be 0), this represents the ring Q(a)[x] together with its minimal polynomial.

Note:
outdated, use gcd instead