Parameter Differentiation of Exponential Operators and the Baker-Campbell-Hausdorff Formula
Morton Lutzky · Journal of Mathematical Physics · 1968
Parameter differentiation of exponential operators is used to derive a method for obtaining the Baker-Campbell-Hausdorff coefficients in a more explicit form than is available from the standard Hausdorff recursion formula. In passing, a derivation of the Hausdorff recursion formula is given which is simpler than the proof usually presented.