Necessary and sufficient condition for convergence of the Magnus series
Let Y(t;κ)Y(t;\kappa)Y(t;κ) denote the solution of … Denote the eigenvalues of Y(t;κ)Y(t;\kappa)Y(t;κ) by λn(t;κ)\lambda_n(t;\kappa)λn(t;κ), ordered so that each λn\lambda_nλn is continuous as a function of ttt. Le…