Read e-book online A Guide to Functional Analysis PDF

By Krantz S.G.

This publication is a short yet specific and cautious advent to the topic of useful research. It covers the fundamental subject matters that may be present in a simple graduate research textual content. however it additionally covers extra refined themes comparable to spectral conception, convexity, and fixed-point theorems. a different function of the publication is that it incorporates a nice many examples or even a few functions. It concludes with a press release and evidence of Lomonosov's dramatic consequence approximately invariant subspaces

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7. Applications of the Big Three 25 for any real constant r . g C i r /j2 Ä 1 C r 2 : We conclude that ˇ 2 C 2rˇ Ä 1 for every real r . This forces ˇ D 0. Since kgkY Ä 1, we conclude next that j˛j Ä 1. 14]). @ /. 14/ z @ for f 2 z. Let us summarize what we have proved: Theorem: To each z 2 there corresponds a positive measure z on the boundary @ that “represents” z in the sense that (14) holds for every f 2 Z. Notice that y determines z uniquely. But, in general, the Hahn-Banach extension is certainly not unique.

So, thus far, we cannot say anything about the uniqueness of the representing measure. Let us specialize down. Let be the unit disc D in the complex plane and let z 2 D. Write z D r e i . w/ D w n for n D 0; 1; 2; : : : . Then un 2 Z. 15/ 26 1. Fundamentals for n D 0; ˙1; ˙2; : : :. 16/ nD 1 for t real. 17/ for n D 0; ˙1; ˙2; : : :. We see that the series (16) is dominated by the convergent geometric P series r jnj , so it is legitimate to insert the series into the integral (17) and to switch the sum and the integral (so that we integrate term by term).

Uj / D aj 27 28 2. uj /j > M kuj k : Since this is true for any M > 0, we find that ˛ is unbounded. Contradiction. fxj g/ D aj xj : j Conversely, if fbj g is any bounded sequence, then the mapping fxj g ! X bj xj j defines a bounded linear functional on `1 . `1 / is `1 . E XAMPLE . Œ0; 1/, then X is the collection of regular Borel measures on Œ0; 1. This is the celebrated Riesz representation theorem. E XAMPLE . T / of Lebesgue integrable functions on the circle group T . T / of essentially bounded functions on T .

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