A Pick function of d variables is a holomorphic map from Πd to Π, where Π is the upper halfplane. Some Pick functions of one variable have an asymptotic expansion at infinity, a power series ∑∞ n=1 ρnz −n with real numbers ρn that gives an asymptotic expansion on non-tangential approach regions to infinity. In 1921 H. Hamburger characterized which sequences {ρn} can occur. We give an extension ...

GADTs can be represented either as their Church encodings a la Atkey, or fixpoints Johann and Polonsky. While GADT its encoding need not support map function satisfying the functor laws, fixpoint representation of must such even to well-defined. The two representations thus same in general. This observation forces choice data types languages supporting GADTs. In this paper we show that choosing...

Histochemical analysis of frontal and temporal lobes from four patients with Pick presenile dementia indicated intracellular and extracellular deposits of gangliosides. Thin layer chromatography of gangliosides disclosed the presence of an unknown ganglioside, a decrease of N-acetylgalactosamine-GDla and an increase of GTla and/or GD2 in white matter of Pick brain. Chromatography of gray matter...

We give a new proof on the disk that a Pick problem can be solved by a rational function that is unimodular on the unit circle and for which the number of poles inside the disk is no more than the number of non-positive eigenvalues of the Pick matrix. We use this method to find rational solutions to Pick problems on the bidisk. Dedicated to the memory of Bela Szokefalvi-Nagy, whose work inspire...