We explicitly describe an expansion of ${\rm e}^{A+B}$ as an infinite sum of the products of $B$ multiplied by the exponential function of $A$. This is the full expansion of the Zassenhaus formula. We also express the Baker-Campbell-Hausdorff formula in a different manner.
Special-case closed form of the Baker-Campbell-Hausdorff formula
A new approach to the Baker-Campbell-Hausdorff expansion
An exact power series representation of the Baker-Campbell-Hausdorff formula
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