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5.1.121 prune
Syntax:
prune ( module_expression )
Type:
- module
Purpose:
- returns the module minimally embedded in a free module such that the
corresponding factor modules are isomorphic.
Note:
- If for the input module the attribute
"isHomog" is
set, prune also sets the attribute "isHomog" .
For non-global orderings, only reduction steps with constant units are
performed. Hence, the returned module does not need to be minimal.
Example:
| ring r=0,(x,y,z),dp;
module m=gen(1),gen(3),[x,y,0,z],[x+y,0,0,0,1];
print(m);
==> 1,0,x,x+y,
==> 0,0,y,0,
==> 0,1,0,0,
==> 0,0,z,0,
==> 0,0,0,1
print(prune(m));
==> y,
==> z
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See
module.
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