## 09-42

#### On feasibility of integer knapsacks

Preprint series: 09-42, Preprints

MSC:
90C10 Integer programming
90C27 Combinatorial optimization

Abstract: Given a matrix $A\in \Z^{m\times n}$ satisfying certain regularity assumptions, we consider the set ${\mathcal F}(A)$ of all vectors ${\ve b}\in \Z^m$ such that the associated {\em knapsack polytope} P(A,{\ve b})=\{{\ve x}\in \R^n_{\ge 0}: A {\ve x}={\ve b}\}\, contains an integer point. When $m=1$ the set ${\mathcal F}(A)$ is known to contain all consecutive integers greater than the Frobenius number associated with $A$. In this paper we introduce the {\em diagonal Frobenius number} $\dfrob(A)$ which reflects in an analogous way feasibility properties of the problem and the structure of ${\mathcal F}(A)$ in the general case. We give an optimal upper bound for $\dfrob(A)$ and also estimate the asymptotic growth of the diagonal Frobenius number on average.

Keywords: Knapsack problem; Frobenius numbers; successive minima; inhomogeneous minimum; distribution of lattices

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Letzte Änderung: 01.03.2018 - Ansprechpartner:

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