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- Title
Quaternionic slice regularity beyond slice domains.
- Authors
Ghiloni, Riccardo; Stoppato, Caterina
- Abstract
After Gentili and Struppa introduced in 2006 the theory of quaternionic slice regular functions, 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 : Ω → H a family of holomorphic stem functions and a family of induced slice regular functions. As we tighten the hypotheses on Ω (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.
- Subjects
HOLOMORPHIC functions; WORKING class; QUATERNION functions
- Publication
Mathematische Zeitschrift, 2024, Vol 306, Issue 3, p1
- ISSN
0025-5874
- Publication type
Article
- DOI
10.1007/s00209-024-03434-7