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Алгебра и анализ, 2022, том 34, выпуск 2, страницы 185–230
(Mi aa1805)
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Статьи
Differentiable functions on modules and equation $\mathrm{grad}\,(w)=\mathsf{M}\,\mathrm{grad}\,(v)$
K. J. Ciosmakab a University of Oxford, Mathematical Institute, Andrew Wiles Building, Radcliffe Observatory Quarter, Woodstock Rd, Oxford OX2 6GG, United Kingdom
b University of Oxford, St John's College, St Giles', Oxford OX1 3JP, United Kingdom
Аннотация:
Let $A$ be a finite-dimensional, commutative algebra over $\mathbb{R}$ or $\mathbb{C}$. We extend the notion of $A$-differentiable functions on $A$ and develop a theory of $A$-differentiable functions on finitely generated $A$-modules. Let $U$ be an open, bounded and convex subset of such a module. We give an explicit formula for $A$-differentiable functions on $U$ of prescribed class of differentiability in terms of real or complex differentiable functions, in the case when $A$ is singly generated and the module is arbitrary and in the case when $A$ is arbitrary and the module is free. We prove that certain components of $A$-differentiable function are of higher differentiability than the function itself.
Let $\mathsf{M}$ be a constant, square matrix. Using the formula mentioned above, we find a complete description of solutions of the equation $\mathrm{grad}\,(w)=\mathsf{M}\,\mathrm{grad}\,(v)$.
We formulate the boundary value problem for generalized Laplace equations $\mathsf{M}\,\nabla^2 v=\nabla^2v \mathsf{M}^{\mathsf{T}}$ and prove that for given boundary data there exists a unique solution, for which we provide a formula.
Ключевые слова:
differentiable functions on algebras, generalised analytic functions, generalised Laplace equations, Banach algebra of $A$-differentiable functions.
Поступила в редакцию: 10.01.2020
Образец цитирования:
K. J. Ciosmak, “Differentiable functions on modules and equation $\mathrm{grad}\,(w)=\mathsf{M}\,\mathrm{grad}\,(v)$”, Алгебра и анализ, 34:2 (2022), 185–230; St. Petersburg Math. J., 34:2 (2023), 271–303
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/aa1805 https://www.mathnet.ru/rus/aa/v34/i2/p185
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Страница аннотации: | 125 | PDF полного текста: | 2 | Список литературы: | 24 | Первая страница: | 13 |
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