Get Differential equations & asymptotic theory in mathematical PDF

By Roderick S C Wong, Hua Chen

ISBN-10: 9812560556

ISBN-13: 9789812560551

This lecture notes quantity encompasses 4 quintessential mini classes added at Wuhan college with each one direction containing the fabric from 5 one-hour lectures. Readers are cited up to now with fascinating contemporary advancements within the parts of asymptotic research, singular perturbations, orthogonal polynomials, and the applying of Gevrey asymptotic growth to holomorphic dynamical structures. The publication additionally positive aspects very important invited papers offered on the convention. prime specialists within the box conceal a various diversity of issues from partial differential equations bobbing up in melanoma biology to transonic surprise waves.

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5. Correlation Theorem. 2 Properties of the DFT 35 and their correlation is given by _ Z(m) 1 =N N-l h;O X(h) Y(m + h), m = 0,1, ... 2-17) Substituting Eq. (15) in Eq. 2-18) Applying the shift theorem [see Eq. (4)] to Eq. (18), we obtain {~ }~X(h) W-kh} Cz(k) = Cy(k) Now, Cz(k) implies that = - 1 N N-l ~ X(h) h=O 1 = - Hence Eq. (19) yields k=0,1, ... 2-20) 0, 1, ... , N - 1 which completes the proof of the theorem. Comment: If the sequences {X(m)} and {Y(m)} are identical, then Eq. 2-21 ) k=0,1, ...

6-7) From the above discussion it is observed that the 2-dimensional DFT in Eq. (1) can be viewed as using a I-dimensional DFT a total of NIN2 times, as follows: (i) With N = N I , the DFT in Eq. 1-1) is used N2 times to obtain [CX(kl' m 2)] given by Eq. (5). (ii) Next with N = N 2 , the DFT in Eq. 1-1) is used Nl times to obtain [CXX(kl' k 2 )] given by Eq. (7). In conclusion, we note that as a consequence of (i) and (ii) above, Eq. 6-8) where Al is a (Nl x N I ) matrix whose elements are CC"8 = r, W~s; 8 = 0, 1, ...

Dt::::;; 2B (N + 1) 3. Equation (16) implies that the sampling frequency satisfy the condition which yields t. 6-16) t. 7 Summary In this chapter we started with the Fourier series, which is the most familiar type of signal representation. For a T-periodic signal, it was shown that as T approaches infinity, the Fourier series yields the Fourier transform. Again it was established that the Fourier transform Fx(w) of a signal x(t), of finite duration L, is exactly specified by the Fourier series at a set of Problems 29 equally spaced points on the w axis.

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Differential equations & asymptotic theory in mathematical physics: Wuhan University, Hubei, China, 20-29 October 2003 by Roderick S C Wong, Hua Chen


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