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A Note on Fourier Transforms and Imbedding Theorems

Published online by Cambridge University Press:  20 November 2018

Robert A. Adams*
Affiliation:
University of British Columbia
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It is well known that Sobolev′s Lemma on the continuity of functions possessing L2 distributional derivatives of sufficiently high order is a simple consequence of elementary properties of the Fourier transform in L2 (e.g. [1, p. 174]). (In fact this statement remains true if 2 is replaced by p, 1 ≤ p ≤ 2). In this note we show that imbedding theorems of the type Wm, p ⊂Lq can also be obtained using Fourier transforms and an elementary lemma which reduces the cases p > 2 to the case p = 2. The simplicity of this approach is obtained at the expense of a slight loss of generality in the imbedding theorem.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 1967

References

1. Yosida, K., Functional analysis, Academic Press, New York, 1965.Google Scholar