Integrable matrix equations related to pairs of compatible associative algebras

We study associative multiplications in semi-simple associative algebras over {\bb C} compatible with the usual one. An interesting class of such multiplications is related to the affine Dynkin diagrams of \skew5\tilde{A}_{2 k-1}, \tilde{D}_{k}, \tilde{E}_{6}, \tilde{E}_{7} , and \tilde{E}_{8} -type. In this paper we investigate in detail the multiplications of the \skew5\tilde{A}_{2 k-1} -type and integrable matrix ODEs and PDEs generated by them.

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