Tensor Products of Power Köthe Spaces of Different Types

The multirectangular characteristics $\mu_m^{(\lambda,c)}$ are applied to the isomorphic classification of tensor products of the form $E_0(a)\mathbin{\widehat\otimes} E_\infty(b)$. We single out a subclass of tensor products such that the two-rectangular characteristic $\mu_2^{(\lambda,c)}$ is a complete invariant on this class.