Science and exile in Latin America. the case of the Uruguayan mathematicians in Venezuela.
Continuous generalized Toeplitz kernels in R
Unitary extensions of isometries, generalized interpolation and band extensions
The aim of this paper is to give a very brief account of some applications of the method of unitary extensions of isometries to interpolation and extension problems.
A refinement of the Helson-Szegö theorem and the determination of the extremal measures
On a general bidimensional extrapolation problem
Several generalized moment problems in two dimensions are particular cases of the general problem of giving conditions that ensure that two isometries, with domains and ranges contained in the same Hilbert space, have commutative unitary extensions to a space that contains the given one. Some results concerning this problem are presented and applied to the extension of functions of positive type.
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