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Monotone interval eigenproblem in max-min algebra. (English) Zbl 1202.15013
A triple \(({\mathcal B},\oplus,\otimes)\) is called a max-min algebra if \({\mathcal B}\) is a linearly ordered set, and \(\oplus=\max\), \(\otimes=\min\) are binary operations on \({\mathcal B}\). These operations are extended to matrices and vectors in a formal way. The eigenproblem of a given \(n\times n\) matrix \(A\) over \({\mathcal B}\) consists in finding a value \(\lambda\in{\mathcal B}\) (= eigenvalue) and a vector \(x\) (= eigenvector) with \(n\) components from \({\mathcal B}\) such that \(A\otimes x= \lambda\otimes x\) holds. This problem can be reduced to \(A\otimes x= x\) which is considered in the paper.
If \({\mathbf A}\) is an \(n\times n\) interval matrix and \({\mathbf X}\) is an interval vector with \(n\) components the interval eigenproblem for \({\mathbf A}\) and \({\mathbf X}\) consists in recognizing whether \(A\otimes x= x\) holds true for \(A\in{\mathbf A}\), \(x\in{\mathbf X}\). In dependence on the applied qualifiers a classification containing six different types of interval eigenvectors \({\mathbf X}\) is introduced, and a detailed characterization of all these types is given for so-called monotone eigenvectors. Moreover, relations between various types of such eigenvectors are presented, illustrated by a Hasse diagram. Simple examples show that certain other specific relations do not hold.

15A18 Eigenvalues, singular values, and eigenvectors
65G30 Interval and finite arithmetic
15A80 Max-plus and related algebras
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