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

Usage:
doubleExt(R,i), R matrix representing the left Module M=D^p/D^q(R^t) over a ring D
int i, less or equal the left projective dimension of M

Return:
matrix P, representing the double ext module

Purpose:
computes a matrix P, which represents the left module ext^i(ext^i(M,D))

Example:
 


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