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

Usage:
allDoubleExt(R), R matrix representing the left Module M=D^p/D^q(R^t) over a ring D

Return:
list T, double indexed, which include all double-ext modules

Purpose:
computes all double ext-modules
T[i][j] gives a representation matrix of ext^(j-1)(ext(i-1)(M,D))

Example:
 


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