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Pick interpolation and invariant functions

Anindya Biswas Annales Polonici Mathematici MSC: Primary 32F45; Secondary 32E30 DOI: 10.4064/ap250220-2-6 Opublikowany online: 30 July 2025

Streszczenie

We establish a connection between Pick bodies and invariant functions. We demonstrate that an invariant function can be associated with any Pick body, which determines the solvability of a given Pick interpolation problem and generalizes the Carathéodory pseudodistance. A complete description of this invariant function is provided for the open unit disc, and it is shown that it leads to another invariant function which can be regarded as a generalized Lempert function. It is also proved that these two invariant functions are equal if certain geodesics can be found. Lastly, we show that, in a very special case, a result analogous to Lempert’s theorem holds for the bidisc and the tridisc.

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