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The calculus of operator functions and operator convexity

The paper is concerned with the Fréchet differentiability and operator convexity of the operator functions on sets of self-adjoint operators on finite-dimensional inner product spaces which are associated with real-valued functions of one or two variables. In Part I it is shown that if a real-valued function is L times continuously differentiable then the associated operator functions are L times Fréchet differentiable with continuous Fréchet derivatives. It is shown that the operator functions...

Spectral synthesis and the Pompeiu problem

L. BrownB. SchreiberB. A. Taylor — 1973

Annales de l'institut Fourier

It is shown that every closed rotation and translation invariant subspace V of C ( R n ) or δ ( R n ) , n 2 , is of spectral synthesis, i.e. V is spanned by the polynomial-exponential functions it contains. It is a classical problem to find those measures μ of compact support on R 2 with the following property: (P) The only function f C ( R 2 ) satisfying R 2 f σ d μ = 0 for all rigid motions σ of R 2 is the zero function. As an application of the above result a characterization of such measures is obtained in terms of their Fourier-Laplace transforms....

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