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=== Exponential function for matrices and Banach algebras ===
The definition of the exponential function exp given above can be used verbatim for every [[Banach algebra]], and in particular for square [[
: <math>\exp(x + y) = \exp(x) \exp(y)</math>
if <math>xy = yx</math> (''we should add the general formula involving commutators here.'')
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