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D.15.23.25 Ker

Procedure from library modules.lib (see modules_lib).

Usage:
Ker(M); M a Matrix

Return:
Module, image of a Matrix N with image(N)=Ker(M)

Example:
 
LIB "modules.lib";
ring r;
matrix m[1][3]=x,y2,z3;
Matrix M=m;
M;
==>     {1}  {2}  {3}
==> {0}   x   y2   z3
==> 
Ker(M);
==> image | y2 z3 0   |
==>       | -x 0  z3  |
==>       | 0  -x -y2 |
==> 
==>