Supertropical Matrix Algebra II: Solving tropical equations

Details Supertropical Matrix Algebra II: Solving tropical equations Supertropical Matrix Algebra II: Solving tropical equations

2009-02-12

arxiv.org/abs/0902.2159v3

Mathematics

Commutative Algebra

16 pages

Scientific paper

We continue the study of matrices over a supertropical algebra, proving the existence of a tangible adjoint of $A$, which provides the unique right (resp. left) quasi-inverse maximal with respect to the right (resp. left) quasi-identity matrix corresponding to $A$; this provides a unique maximal (tangible) solution to supertropical vector equations, via a version of Cramer's rule. We also describe various properties of this tangible adjoint, and use it to compute supertropical eigenvectors, thereby producing an example in which an $n\times n$ matrix has $n$ distinct supertropical eigenvalues but their supertropical eigenvectors are tropically dependent.

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