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For two matrices $A$ and $B$, and large $n$, we show that most products of$n$ factors of $e^{A/n}$ and $n$ factors of $e^{B/n}$ are close to $e^{A + B}$.This extends the Lie-Trotter formula. The elementary proof is based on therelation between words and lattice paths, asymptotics of binomial coefficients,and matrix inequalities. The result holds for more than two matrices.

Product of exponentials concentrates around the exponential of the sum