On max-plus two-sided linear systems whose solution sets are min-plus linear
(2402.07358)Abstract
The max-plus algebra $\mathbb{R}\cup {-\infty }$ is defined in terms of a combination of the following two operations: addition, $a \oplus b := \max(a,b)$, and multiplication, $a \otimes b := a + b$. In this study, we propose a new method to characterize the set of all solutions of a max-plus two-sided linear system $A \otimes x = B \otimes x$. We demonstrate that the minimum min-plus'' linear subspace containing the
max-plus'' solution space can be computed by applying the alternating method algorithm, which is a well-known method to compute single solutions of two-sided systems. Further, we derive a sufficient condition for the min-plus'' and
max-plus'' subspaces to be identical. The computational complexity of the method presented in this study is pseudo-polynomial.
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