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D.15.21.7 Source

Procedure from library modules.lib (see modules_lib).

Usage:
Source(M); M Matrix

Return:
FreeModule, source of the Matrix

Example:
 
LIB "modules.lib";
ring r;
matrix m[2][2]=x,y3,z,xz;
Matrix M=m;
M;
==> x,y3,
==> z,xz 
==> 
Source(M);
==>  2
==> r
==> free Module
==>