/sci/ - Science & Math

following Eichler's proof of Baker-campbell-hausdorff, (proof can be found in Naive lie theory by Stillwell, John, pg157 or Introduction to lie groups and lie algebras
by Sagle, Arthur A,pg 133) but I can't seem to work out how relations (5) and (6) are combined like they say it is in the related picture (a section from the second source)