An approximation of matrix exponential by a truncated Laguerre series

E. D. Khoroshikh, V. G. Kurbatov

The Laguerre functions $l_{n,\tau }^{\alpha }$, $n=0,1,\dots$, are constructed from generalized Laguerre polynomials. The functions $l_{n,\tau }^{\alpha }$ depend on two parameters: scale $\tau >0$ and order…