Abstract
In Chap. 29, we have defined the symbol Di, where i = (i1,…, i N ) is an N-dimensional vector whose coordinates are nonnegative integers, by the relation
Here, \(\left| i \right| = {i_1} + \ldots + {i_N}.\)
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© 1977 Karel Rektorys
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Rektorys, K. (1977). Elliptic Differential Operators of Order 2k. Weak Solutions of Elliptic Equations. In: Variational Methods in Mathematics, Science and Engineering. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6450-4_33
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DOI: https://doi.org/10.1007/978-94-011-6450-4_33
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-011-6452-8
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