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D.6.11.19 allsquarefree
Procedure from library hnoether.lib (see hnoether_lib).
- Usage :
- allsquarefree(f,g); f,g poly
- Assume:
- g is the output of
squarefree(f).
- Return:
- the greatest squarefree divisor of f.
- Note :
- This proc uses factorize to get the missing factors of f not in g and,
therefore, may be slow.
Example:
| | LIB "hnoether.lib";
ring exring=7,(x,y),dp;
poly f=(x+y)^7*(x-y)^8;
poly g=squarefree(f);
g; // factor x+y lost, since characteristic=7
==> x-y
allsquarefree(f,g); // all factors (x+y)*(x-y) found
==> x2-y2
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See also:
squarefree.
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