This paper deals with some ideas of Bézout and his successors Poisson, Netto and Laurent for solving polynomial systems. We treat them from the determinantal and from the Gröbner basis point of view. This results in effective algorithms for constructing the multivariate resultant. Other problems of Elimination Theory are discussed: how to find an eliminant for a polynomial system, how to represent its zeroes as the rational functions of the roots of this eliminant and how to separate zeroes.
Given the equations of the first and the second order surfaces in R n , our goal is to construct a univariate polynomial one of the zeros of which coincides with the square of the distance between these surfaces. To achieve this goal we employ Elimination Theory methods. The proposed approach is also extended for the case of parameter dependent surfaces.
For the Weber problem of construction of the minimal cost planar weighted network connecting four terminals with two extra facilities, the solution by radicals is proposed. The conditions for existence of the network in the assumed topology and the explicit formulae for coordinates of the facilities are presented. The obtained results are utilized for investigation of the network dynamics under variation of parameters. Extension of the results to the general Weber problem is also discussed.
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