Download e-book for kindle: Fourier Analysis and Applications: Filtering, Numerical by Claude Gasquet

By Claude Gasquet

ISBN-10: 1461215986

ISBN-13: 9781461215981

ISBN-10: 1461272114

ISBN-13: 9781461272113

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"This e-book must have huge charm, from those people who are simply stepping into the world and need to profit mathematical foundations and functions to people who are already skilled and want to have a reference that gives a mathematically rigorous insurance of the nation of the art…The insurance is thorough yet now not overwhelming, might be as the chapters are divided into classes, permitting the reader an opportunity to pause and imagine. The authors paintings essentially to impart an realizing of the speculation and purposes, and never simply provide an encyclopedic tome."

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Additional info for Fourier Analysis and Applications: Filtering, Numerical Computation, Wavelets

Sample text

Periodic window. 1 The space L~(O, a) In a famous paper dated 1807, Joseph Fourier asserted that the answer to this question was "yes," provided that infinite sums are allowed. He arrived at his results by a very circuitous route using the "tools at band," which is to say, the mathematical techniques available at that time. Recall that at the beginning of the nineteenth century, not only was the notion of convergence rather vague, but the definition of function itself was open to controversy. For example, the following question was debated: Is a function 28 Lesson 4.

4). , g) = 1a f(t)g(t) dt. The associated norm is given by llfii2=JU,f)=( 1 a o lf(tWdt) 1/2 . It is important to note that the norm of f can be zero even though the function f E L~(O, a) is not zero at every point. For example, f could be zero at all but a finite nurober of points. Thus, to have a true norm, it is necessary to identify such a function with the function that is identically zero, which we sometimes call the null function. 3). e. e. on (0, a). " More precisely, we can try to answer the following question: Given an integer N, is it possible to find coefficients Xn suchthat N L II/- Xnenll2 attains a minimum?

N(to) as N ~ ~ 1 2[f(to+) + f(to- )] +oo. N(to) ~ f(to). Proof. 4). The assumption that the left and right derivatives exist means that the quantities 1 - (f(to X + x) - f(to+)) and 1 - (f(to - x)- f(to-)) X 44 Lesson 5. Pointwise Representation tend to finite limits as 0 and M > 0 suchthat l

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Fourier Analysis and Applications: Filtering, Numerical Computation, Wavelets by Claude Gasquet


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