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matrix; characteristicpolynomial; characteristic equation
No polynomial algorithms are known for finding the coefficients of the characteristic polynomial and characteristic equation of a matrix in max- algebra. The following are proved: (1) The task of finding the max-algebraic characteristic polynomial for permutation matrices encoded using the lengths of their constituent cycles is NP-complete. (2) The task of finding the lowest order finite term of the max-algebraic characteristic polynomial for a $\lbrace 0,-\infty \rbrace $ matrix can be converted to the assignment problem. (3) The task of finding the max-algebraic characteristic equation of a $\lbrace 0,-\infty \rbrace $ matrix can be converted to that of finding the conventional characteristic equation for a $\lbrace 0,1\rbrace $ matrix and thus it is solvable in polynomial time.
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