Download Classical Fourier Analysis by Loukas Grafakos PDF

By Loukas Grafakos

The basic target of this article is to provide the theoretical starting place of the sphere of Fourier research. This booklet is principally addressed to graduate scholars in arithmetic and is designed to serve for a three-course series at the topic. the single prerequisite for realizing the textual content is passable crowning glory of a path in degree conception, Lebesgue integration, and complicated variables. This booklet is meant to provide the chosen issues in a few intensity and stimulate extra examine. even though the emphasis falls on actual variable equipment in Euclidean areas, a bankruptcy is dedicated to the basics of research at the torus. This fabric is integrated for old purposes, because the genesis of Fourier research are available in trigonometric expansions of periodic services in different variables.

While the first version used to be released as a unmarried quantity, the recent version will comprise one hundred twenty pp of latest fabric, with an extra bankruptcy on time-frequency research and different glossy subject matters. accordingly, the ebook is now being released in 2 separate volumes, the 1st quantity containing the classical themes (Lp areas, Littlewood-Paley idea, Smoothness, etc...), the second one quantity containing the fashionable themes (weighted inequalities, wavelets, atomic decomposition, etc...).

From a evaluate of the 1st edition:

“Grafakos’s e-book is especially common with a number of examples illustrating the definitions and ideas. it really is more desirable for readers who are looking to get a suppose for present examine. The remedy is punctiliously smooth with unfastened use of operators and useful research. Morever, in contrast to many authors, Grafakos has essentially spent loads of time getting ready the exercises.” - Ken Ross, MAA Online

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Example text

21) whenever f and g are simple functions on X and Y , respectively. 22) is analytic in the open strip S = {z ∈ C : 0 < Re z < 1} and continuous on its closure. 23) for all z satisfying 0 ≤ Re z ≤ 1. The extension of the Riesz–Thorin interpolation theorem is now stated. 7. Let Tz be an analytic family of linear operators of admissible growth. 24) 1 L p Spaces and Interpolation 38 for j = 0, 1 and some b < π. Let 0 < θ < 1 satisfy 1 1−θ θ + = p p0 p1 and 1 1−θ θ + . 28) for all simple functions f on X.

2. 2, N f (x) = ∑ a j χE j (x) , j=1 where the sets E j have finite measure and are pairwise disjoint and a1 > · · · > aN . 2 that N d f (α) = ∑ B j χ[a j+1 ,a j ) (α) , j=0 where j B j = ∑ µ(Ei ) i=1 and aN+1 = B0 = 0 and a0 = ∞. Observe that for B0 ≤ t < B1 , the smallest s > 0 with d f (s) ≤ t is a1 . Similarly, for B1 ≤ t < B2 , the smallest s > 0 with d f (s) ≤ t is a2 . Arguing this way, it is not difficult to see that f ∗ (t) = N ∑ a j χ[B j−1 ,B j ) (t) . 3. On (Rn , dx) let f (x) = 1 , 1 + |x| p 0 < p < ∞.

2 Convolution and Approximate Identities 23 Since 1/r = 1/p + 1/q, it follows that 1 < r < p . Select t = 1 and s = p . 23) M if p = ∞. 23) if p = ∞, is equal to α/2. For instance, choose M = (α p 2−p rq−1 f if p < ∞ and M = α/(2 f L1 ) −p Lp g −r 1/(p −r) Lr,∞ ) if p = ∞. For this choice of M we have that d f ∗g1 (α/2) = 0. 21) with t = 1 we obtain f ∗ g2 Lp ≤ f Lp g2 L1 ≤ f r Lp r − 1 M 1−r g r . 25) which is the required inequality. This proof gives that the constant C p,q,r blows up like (r − 1)−p/q as r → 1.

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