An Introduction to Wavelet Analysis by David F. Walnut

By David F. Walnut

This publication presents a finished presentation of the conceptual foundation of wavelet research, together with the development and research of wavelet bases. It motivates the imperative rules of wavelet idea through delivering a close exposition of the Haar sequence, then exhibits how a extra summary procedure permits readers to generalize and increase upon the Haar sequence. It then offers a few diversifications and extensions of Haar building.

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28. c) in L" 071 a n ~ntcmnlI . r) + f (z) poi7~t7uise an I . 44. An irllportai~ttheorcn~fro111 ;idvailced calc111usis t,he followillg. Its proof 16 Chapter 1. Functions and Convergence is left as an exercise but can be found in almost any advanced calculus book (for example, Rurk, p. 266, Theorem 3). 29, If fn(x) + f (x) unzformly on the interval 1 , and if each f , , ( x ) is continzious on I , t h . sson I . 45. 30. 5). 29 would be as follows. 29 irmplies that f (z)shou,ld also be continuous.

There are two ways to do this. 1. Extend the definition of function. This has been done by L. Schwartz who defined the notion of a distribution or generalized f u n ~ t i o n . ~ 2. Approximate the delta by ordinary functions in some sense. This more elementary approach has its natural completion in the theory of distributions alluded to above, but can be understood without any advanced concept,s. 2. The purpose of this section is to explain the theory of approximate identities. 2. I Motivation from Fourier.

R )+ f ( x ) ~ n i f o , r m l yo n 1 ass 71 + m . T h e series f , , ( z ) = f ( z ) u n i f o m l ~o n I zf the sequence of partial sums SN(X) = xr=, zit=l fn N ( 2 ) converges ~ ~ n i f o m to l y f (x) on I . 27. (a) With uniforl~lconvelgence. for a given E the sanie N works for all x E I, whereas with pointwise Convergence N may depend on both F arid x. In other words, unifornl convergerice says that given E > 0 there is an N > 0 such that for all n ',N , the maximum difference between f,,(x) and f ( J ) on I is smaller than E .

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