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Solving systems of polynomial inequalities in subexponential time. (English) Zbl 0662.12001
The authors developed a subexponential time algorithm to find real solutions of systems of polynomial inequalities. A method of finding real roots of a polynomial was introduced as a starting point of the algorithm and the general case was reduced to this case. Theoretical background of the algorithm was given in details in the paper while a general outline of the algorithm was provided. The algorithm has a running time bounded by $$M(kd)^{n^ 2}$$, where k is the number of polynomials with degrees less than d and coefficients not exceeding $$2^ M$$, n is the number of the variables. The previously known upper bound for this problem was $$(Mkd)^{2^{O(n)}}$$.
Reviewer: J.Liang

##### MSC:
 12-04 Software, source code, etc. for problems pertaining to field theory 68Q25 Analysis of algorithms and problem complexity 12D15 Fields related with sums of squares (formally real fields, Pythagorean fields, etc.) 14Pxx Real algebraic and real-analytic geometry 11R09 Polynomials (irreducibility, etc.) 68W30 Symbolic computation and algebraic computation
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