Mean-periodic function

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In mathematical analysis, the concept of a mean-periodic function is a generalization introduced by Jean Delsarte, of the concept of a periodic function.[1]

Consider a complex-valued function ƒ of a real variable. The function ƒ is periodic with period a precisely if for all real x, we have ƒ(x) − ƒ(x − a) = 0. This can be written as

where is the difference between the Dirac measures at 0 and a. A mean-periodic function is a function ƒ satisfying (1) for some nonzero measure with compact (hence bounded) support.

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