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Error bounds for the truncated Baker--Campbell--Hausdorff and Zassenhaus formulas in unitary problems
The Baker Campbell Hausdorff (BCH) formula plays a critical role in many branches of mathematics and physics. It expresses the logarithm of the product of exponentials of non commuting operators as an infinite series of nested commutators of the operators involved. The Zassenhaus formula is the dual of the BCH formula: the exponential of a sum of operators is written as an infinite product of exponentials involvin...