An algorithmic theory of numbers, graphs, and convexity by Laszlo Lovasz

By Laszlo Lovasz

A examine of the way complexity questions in computing have interaction with classical arithmetic within the numerical research of matters in set of rules layout. Algorithmic designers fascinated with linear and nonlinear combinatorial optimization will locate this quantity in particular precious.

Two algorithms are studied intimately: the ellipsoid procedure and the simultaneous diophantine approximation technique. even supposing either have been constructed to review, on a theoretical point, the feasibility of computing a few really good difficulties in polynomial time, they seem to have functional purposes. The e-book first describes use of the simultaneous diophantine technique to boost subtle rounding methods. Then a version is defined to compute top and reduce bounds on a variety of measures of convex our bodies. Use of the 2 algorithms is introduced jointly through the writer in a examine of polyhedra with rational vertices. The e-book closes with a few purposes of the implications to combinatorial optimization.

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We may assume without loss of generality that pn+i < 0 . Let q = —pn+i , then we have and AN ALGORITHMIC THEORY 29 or Thus, a "short" vector in C(A) yields a "good" simultaneous approximation of o t i , . . ,Q n . To make this argument precise, choose Q = 2 n ( n + 1 )/ 4 e~ n . 11) that we can find, in polynomial time, a vector 6 e £(A) such that 6 ^ 0 and and hence Hence we obtain the following theorem. 2) Theorem. Given Q i , . . , a n e Q and 0 < e < 1 , we can find in polynomial time integers pi,...

However, we want a guarantee for these properties. 12) The convex set described by this box is contained in S(0,R}. 13) The convex set described by this box contains a ball with radius r . 15) The convex set described by this box has volume at least v . These three versions are, however, equivalent in the following sense. 14) holds with w = 2r . 13) holds with r = w/(n + 1) . 13) holds. It will be convenient to assume that in these guarantees we have always R > 1 and r, v, w < 1 . For our purposes, the interesting cases will be when r, v, w are very small and R is very large.

Then XkiK . Let Q be an affine transformation mapping Ek onto the unit ball 5(0,1) . Then 0 ^ QK . Furthermore, it is easy to design a centered well-guaranteed weak membership oracle for QK . e. a vector c e R n such that He'll = 1 and CTX < e+ ^-j- \x\ for all x e K . Consider now the set AN ALGORITHMIC THEORY 53 By the choice of c , B1 contains K . Now B' is more than a half ball; still, it can be included in an ellipsoid E'k+1 such that vol E'k+l < vol 5(0,1). In fact, by lengthy but elementary computations.

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