Download Abstract Harmonic Analysis: Volume 1: Structure of by Edwin Hewitt, Kenneth A. Ross PDF

By Edwin Hewitt, Kenneth A. Ross

Contents: Preliminaries. - parts of the idea of topolo- gical teams. -Integration on in the community compact areas. - In- version functionals. - Convolutions and crew representa- tions. Characters and duality of in the neighborhood compact Abelian teams. - Appendix: Abelian teams. Topological linear spa- ces. creation to normed algebras. - Bibliography. - In- dex of symbols. - Index of authors and phrases.

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I 3 34 Chapter H. Elements of the theory of topological groups Proof. Suppose that H has an interior point x. Then there is a neighborhood U of e in G such that x U c H. For every y EH, we then have y U = Y X-I X U c yx-1H =H. Hence H is open. If His open, then by definition every point of H is an interior point. If H is an open subgroup of G, then H' = U {xH: xtfH}. Each set xH is open, and so H' is open; that is, His closed. 6) Theorem. Let d be a lamily 01 neighborhoods 01 e in a topological group G such that: (i) lor each UEd, there is a VEd such that V 2 c U; (ii) lor each UEd, there is a VEd such that V-1c U; (iii) lor each U, VEd, there is a WEd such that Wc un V.

Again let x, yEG be such that x-1YE V. ,k and hence tp(y)E Y/p(x k) and tp(x)EY/p(Xk). It follows that /p(y)/p(X)-l= tp (y) tp(Xk)-ltp (Xk) /p (x)-lE Y2 e W. If x, YEA;r, then tp (y) /p(x)-lE Pe W. (H)). 16) Corollary. 15). Proof. 15). 17) Corollary. Let G be a compact group. Then the structures 9; (G) and 9;. (G) are equivalent. Proof. 15). (G) are equivalent. 9). 0 Miscellaneous theorems and examples We now list a number of examples of topological groups and give other illustrations of the definition of a topological group, uniform structures, etc.

01 37 G onto GjH is an open Proof. 4) and hence q;(U)={uH:UEU} is open in GjH. 0 It is easy to see thatthe natural mapping q; of G onto GjH need not be a closed mapping: q;(A) may be nonclosed in GjH for closed subsets A of G. A simple example is provided by the additive group R and RjZ. Every coset x Z in R contains the number x - [x] [[x] is the integral part of x] and no other ,number in [0,1[. Thus [0,1 [ can be taken as the space RjZ. It is not hard to see that the topology imposed on [0,1 [ as a model of the space RjZ is the following.

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