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# Lectures on Topics in Mean Periodic Functions and the Two-Radius Theorem

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**Lectures on Topics in Mean Periodic Functions and the Two-Radius Theorem**

by J. Delsarte

**Publisher**: Tata Institute of Fundamental Research 1961**ISBN/ASIN**: B0007J92RQ**Number of pages**: 151

**Description**:

Subjects treated: transmutations of singular differential operators of the second order in the real case; new results on the theory of mean periodic functions; proof of the two-radius theorem, which is the converse of Gauss's classical theorem on the spherical mean for harmonic functions.