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D.12.7.2 nrRootsDeterm

Procedure from library rootsmr.lib (see rootsmr_lib).

Return:
int: the number of real roots of the ideal I by a deterministic algorithm

Assume:
If I is not a Groebner basis, then a Groebner basis will be computed by using std. If I is already a Groebner basis (i.e. if attrib(I,"isSB"); returns 1) then this Groebner basis will be used, hence it must be one w.r.t. (any) global ordering. This may be useful if the ideal is known to be a Groebner basis or if it can be computed faster by a different method.

Note:
If printlevel>0 the number of complex solutions is displayed (default: printlevel=0). The procedure nrRootsProbab is usually faster.

Example:
 
See also: nrRootsProbab; nrroots; solve; sturmquery.


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