|  |  D.15.23.2 zero Procedure from librarymodules.lib(see  modules_lib).
 
Example:Usage:
zero(n); n and m integer
Return:
returns the n x m zero matrix, with nongraded free modules for source and target
 |  | LIB "modules.lib";
ring r;
int n=4;
int m=3;
zero(n,m);
==>     {0} {0} {0}
==> {0}   0   0   0
==> {0}   0   0   0
==> {0}   0   0   0
==> {0}   0   0   0
==> 
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