A $\hat{I}¼$-mode approach for exponential integrators: actions of $\ddot{I}†$-functions of Kronecker sums

Marco Caliari, Fabio Cassini, Franco Zivcovich

We present a method for computing actions of the exponential-like $\ddot{I}†$-functions for a Kronecker sum $K$ of $d$ arbitrary matrices $A_{\hat{I}}¼$. It is based on the approximation of the i…