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D.4.17.8 modregCM

Procedure from library noether.lib (see noether_lib).

Usage:
modregCM(i); i ideal

Return:
an integer, the Castelnuovo-Mumford regularity of i.
(returns -1 if i is not homogeneous)

Assume:
i is a homogeneous ideal and the characteristic of base field is zero..

Note:
This is a probabilistic procedure, and it computes the initial of the ideal modulo the prime number 2147483647 (the biggest prime less than 2^31).