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D.15.21.22 subquotient

Procedure from library modules.lib (see modules_lib).

Usage:
subquotient(gens,rels); gens and rels Matrices

Return:
Module, the subquotient of two entered Matrices

Example:
 
LIB "modules.lib";
ring r;
matrix m[2][2]=x,y2,z,xz;
Matrix M=m;
matrix n[2][3]=z2,xyz,x2y2,xy,x3,y4;
Matrix N=n;
M;
==>     {1}  {2}
==> {0}   x   y2
==> {0}   z   xz
==> 
N;
==>      {2}   {3}    {4}
==> {0}   z2   xyz   x2y2
==> {0}   xy    x3     y4
==> 
subquotient(M,N);
==> subquotient (| x y2 |, | z2 xyz x2y2 |)
==>              | z xz |  | xy x3  y4   | 
==> 
==>