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D.12.8.9 allreal
Procedure from libraryrootsur.lib (see rootsur_lib).
- Usage:
- allreal(p);
- Return:
- int: 1 if and only if all the roots of p are real, 0 otherwise
LIB "rootsur.lib"; ring r = 0,x,dp; poly p = (x+2)*(x-1)*(x-5); allreal(p); ==> 1 p = p*(x2+1); allreal(p); ==> 0 |