A -seeley-extension-theorem for Bastiani’s differential calculus

We generalize a classical extension result by Seeley in the context of Bastiani’s differential calculus to infinite dimensions. The construction follows Seeley’s original approach, but is significantly more involved as not only $C^k$ -maps (for ) on (subsets of) half spaces are extended, but also co...

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Bibliographic Details
Published in:Canadian journal of mathematics 2023-02, Vol.75 (1), p.170-201
Main Author: Hanusch, Maximilian
Format: Article
Language:English
Subjects:
Calculus
Differential calculus
Half spaces
Operators (mathematics)
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Summary:We generalize a classical extension result by Seeley in the context of Bastiani’s differential calculus to infinite dimensions. The construction follows Seeley’s original approach, but is significantly more involved as not only $C^k$ -maps (for ) on (subsets of) half spaces are extended, but also continuous extensions of their differentials to some given piece of boundary of the domains under consideration. A further feature of the generalization is that we construct families of extension operators (instead of only one single extension operator) that fulfill certain compatibility (and continuity) conditions. Various applications are discussed as well.
ISSN:0008-414X
1496-4279
DOI:10.4153/S0008414X21000596