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D.8.6.10 remainderMain

Procedure from library zeroset.lib (see zeroset_lib).

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

Purpose:
compute the remainder r s.t. f = g*q + r, deg(r) < deg(g)

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outdated, use mod/reduce instead