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D.4.16.1 id

Procedure from library modules.lib (see modules_lib).

Usage:
id(n); n integer

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

Example:
 
LIB "modules.lib";
ring r;
int n=4;
id(n);
==>     {0} {0} {0} {0}
==> {0}   1   0   0   0
==> {0}   0   1   0   0
==> {0}   0   0   1   0
==> {0}   0   0   0   1
==>

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