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

Usage:
allExtOfLeft(M),

Return:
list, entries are ext-modules

Assume:
M presents a left module of finite left projective dimension n

Purpose:
For a left module presented by M over the basering D,
compute a list T, whose entry T[i+1] is a matrix, presenting the right module Ext^i_D(M,D) for i=0..n

Example:
 


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