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D.15.21.36 presentation

Procedure from library modules.lib (see modules_lib).

Return:
Subquotient M converted to coker(C)

Example:
 
LIB "modules.lib";
ring R = 0,(x,y),dp;
matrix a[1][2] = x,y;
Matrix A = a;
matrix b[1][2] = x2,y2;
Matrix B = b;
Module M = subquotient(A,B);
presentation(M);
==> cokernel | 0 x -y |
==>          | y 0 x  |
==> 
==>