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ILLINOIS JOURNAL OF MATHEMATICS, vol.43, no.3, pp.427-446, 1999 (SCI-Expanded)
Let (X, F, mu) be a probability space and let L-2(X, 0) be the collection of all f is an element of L-2(X) with zero integrals. A collection A of linear operators on L-2(X) is said to satisfy the Gaussian-distribution property (G.D.P.) if L-2(X, 0) is invariant under A and there exists a constant C < infinity such that the following condition holds: