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Variational bound principle for irregular waveguides

✍ Scribed by Kalikstein, K.


Book ID
118683394
Publisher
The Institution of Electrical Engineers
Year
1980
Weight
156 KB
Volume
127
Category
Article
ISSN
0143-7097

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E. Helly's selection principle states that an infinite bounded family of real functions on the closed inter¨al, which is bounded in ¨ariation, contains a pointwise con¨ergent sequence whose limit is a function of bounded ¨ariation. We extend this theorem to metric space valued mappings of bounded va