The coefficients of the Baker–Campbell–Hausdorff expansion are calculated by using various methods. Comparison of the results yields several remarkable identities satisfied by multiple commutators, which, in turn, allow us to greatly simplify the form of the expansion up to order eight.
No takes yet. Share an insight, caveat, or question.
J A Oteo (1991) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: