Read e-book online A Short Course on Banach Space Theory PDF

By N. L. Carothers

ISBN-10: 0521842832

ISBN-13: 9780521842839

This can be a brief path on Banach area thought with designated emphasis on convinced points of the classical idea. specifically, the path specializes in 3 significant issues: The basic concept of Schauder bases, an advent to Lp areas, and an advent to C(K) areas. whereas those subject matters may be traced again to Banach himself, our basic curiosity is within the postwar renaissance of Banach house thought led to through James, Lindenstrauss, Mazur, Namioka, Pelczynski, and others. Their dependent and insightful effects are valuable in lots of modern examine endeavors and deserve higher exposure. when it comes to necessities, the reader will desire an effortless figuring out of useful research and no less than a passing familiarity with summary degree idea. An introductory path in topology might even be priceless, although, the textual content contains a short appendix at the topology wanted for the direction.

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Extra resources for A Short Course on Banach Space Theory

Example text

A basis with constant 1 is sometimes called a monotone basis. The canonical basis for p , for example, is a monotone basis. It follows from the proof of our first theorem that any Banach space with a basis can always be given an equivalent norm under which the basis constant becomes 1. Indeed, |||x||| = supn Pn x does the trick. We next formulate a “test” for basic sequences; this, too, is due to Banach. 2. A sequence (xn ) of nonzero vectors is a basis for the Banach space X if and only if (i) (xn ) has dense linear span in X , and (ii) there is a constant K such that n m ai xi ≤ K i=1 ai xi i=1 for all scalars (ai ) and all n < m.

1 was first proved by Bessaga in his thesis but credits Mazur for the idea behind both Bessaga’s proof and Pelczy´nski’s (presented here). In a later paper, Pelczy´nski [115] refers also to a 1959 paper by Bessaga and Pelczy´nski [16]. The material on disjointly supported sequences in L p and p is “old as the hills” and was well known to Banach. The variations offered by the notion of “almost disjointness” and the principle of small perturbations, however, are somewhat more modern and can be traced to the early work of Bessaga and Pelczy´nski [15].

Block Basic Sequences Let (xn ) be a basic sequence in a Banach space X . Given increasing sequences q of positive integers p1 < q1 < p2 < q2 < · · ·, let yk = i=k pk bi xi be any nonzero vector in the span of x pk , . . , xqk . We say that (yk ) is a block basic sequence with respect to (xn ). It’s easy to see that (yk ) is, indeed, a basic 44 Block Basic Sequences 45 sequence with the same basis constant as (xn ): n n qk ak yk = m qk ak bi xi ≤ K k=1 i= pk k=1 m ak bi xi = K k=1 i= pk ak yk .

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