Procedure from library noether.lib (see noether_lib).
Usage:
nsatiety (i); i ideal,
Return:
an integer, the satiety of i.
(returns -1 if i is not homogeneous)
Assume:
i is a homogeneous ideal of the basering R=K[x(0)..x(n)].
Theory:
The satiety, or saturation index, of a homogeneous ideal i is the
least integer s such that, for all d>=s, the degree d part of the
ideals i and isat=sat(i,maxideal(1))[1] coincide.
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