English

Looking for all solutions of the Max Atom Problem (MAP)

Combinatorics 2024-08-27 v1

Abstract

This present paper provides the absolutely necessary corrections to the previous work entitled {\it A polynomial Time Algorithm to Solve The Max-atom Problem} (arXiv:2106.08854v1). The max-atom-problem (MAP) deals with system of scalar inequalities (called atoms or max-atom) of the form: xa+max(y,z)x \leq a + \max(y,z). Where aa is a real number and x,yx,y and zz belong to the set of the variables of the whole MAP. A max-atom is said to be positive if its scalar aa is 0\geq 0 and stricly negative if its scalar a<0a <0. A MAP will be said to be positive if all atoms are positive. In the case of non positive MAP we present a saturation principle for system of vectorial inequalities of the form xAx+bx \leq A x + b in the so-called (max,+)(\max,+)-algebra assuming some properties on the matrix AA. Then, we apply such principle to explore all non-trivial solutions (ie \neq -\infty). We deduce a strongly polynomial method to express all solutions of a non positive MAP. In the case a positive MAP which has always the vector x1=(0)x^{1}=(0) as trivial solution we show that looking for all solutions requires the enumeration of all elementary circuits in a graph associated with the MAP. However, we propose a strongly polynomial method wich provides some non trivial solutions.

Keywords

Cite

@article{arxiv.2408.14256,
  title  = {Looking for all solutions of the Max Atom Problem (MAP)},
  author = {Laurent Truffet},
  journal= {arXiv preprint arXiv:2408.14256},
  year   = {2024}
}

Comments

in French language

R2 v1 2026-06-28T18:23:57.176Z