Poisson transform

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The integral transform


where is a function of bounded variation in every finite interval, and also the transform

which results from (*) if is an absolutely-continuous function (cf. Absolute continuity). Let

and let

The following inversion formulas hold for the Poisson transform:

for all , and

almost everywhere.

Let be a convex open acute cone in with vertex at zero and let be the dual cone, that is,

The function

is called the Cauchy kernel of the tube domain . The Poisson transform of a (generalized) function is the convolution (cf. Convolution of functions)


is the Poisson kernel of the tube domain (see [2]).


[1] H. Pollard, "The Poisson transform" Trans. Amer. Math. Soc. , 78 : 2 (1955) pp. 541–550
[2] V.S. Vladimirov, "Generalized functions in mathematical physics" , MIR (1977) (Translated from Russian)
How to Cite This Entry:
Poisson transform. Yu.A. BrychkovA.P. Prudnikov (originator), Encyclopedia of Mathematics. URL:
This text originally appeared in Encyclopedia of Mathematics - ISBN 1402006098