Quaternionic slice regularity beyond slice domains
| Autor: | Ghiloni, Riccardo, Stoppato, Caterina |
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| Rok vydání: | 2023 |
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| Zdroj: | Math. Z., 306(3):55 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/s00209-024-03434-7 |
| Popis: | After Gentili and Struppa introduced in 2006 the theory of quaternionic slice regular function, the theory has focused on functions on the so-called slice domains. The present work defines the class of speared domains, which is a rather broad extension of the class of slice domains, and proves that the theory is extremely interesting on speared domains. A Semi-global Extension Theorem and a Semi-global Representation Formula are proven for slice regular functions on speared domains: they generalize and strengthen some known local properties of slice regular functions on slice domains. A proper subclass of speared domains, called hinged domains, is defined and studied in detail. For slice regular functions on a hinged domain, a Global Extension Theorem and a Global Representation Formula are proven. The new results are based on a novel approach: one can associate to each slice regular function $f:\Omega\to\mathbb{H}$ a family of holomorphic stem functions and a family of induced slice regular functions. As we tighten the hypotheses on $\Omega$ (from an arbitrary quaternionic domain to a speared domain, to a hinged domain), these families represent $f$ better and better and allow to prove increasingly stronger results. Comment: 42 pages, 12 figures, 1 table. To appear in Mathematische Zeitschrift |
| Databáze: | arXiv |
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