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11: 6.4 Analytic Continuation
12: 28.30 Expansions in Series of Eigenfunctions
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►Let , , be the set of characteristic values (28.29.16) and (28.29.17), arranged in their natural order (see (28.29.18)), and let , , be the eigenfunctions, that is, an orthonormal set of -periodic solutions; thus
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28.30.2
►Then every continuous -periodic function whose second derivative is square-integrable over the interval can be expanded in a uniformly and absolutely convergent series
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28.30.4
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13: 24.11 Asymptotic Approximations
14: 6.16 Mathematical Applications
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►uniformly for .
Hence, if is fixed and , then , , or according as , , or ; compare (6.2.14).
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►The first maximum of for positive occurs at and equals ; compare Figure 6.3.2.
…Similarly if , then the limiting value of undershoots by approximately 10%, and so on.
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►where is the number of primes less than or equal to .
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15: 10.64 Integral Representations
16: 10.61 Definitions and Basic Properties
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►In general, Kelvin functions have a branch point at and functions with arguments are complex.
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