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7.7.16.0. gradeNumber
Procedure from library purityfiltration.lib (see purityfiltration_lib).

Usage:
gradeNumber(R), R matrix, representing M=D^p/D^q(R^t) over a ring D

Return:
int, grade number of M

Purpose:
computes the grade number of M, i.e. the first i, with ext^i(M,D) !=0
returns -1 if M=0

Example:
 


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            User manual for Singular version 3-1-6, Dec 2012, generated by texi2html.