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D.15.23.2 zero

Procedure from library modules.lib (see modules_lib).

Usage:
zero(n); n and m integer

Return:
returns the n x m zero matrix, with nongraded free modules for source and target

Example:
 
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
==>