Download Elements of Functional Analysis by Francis Hirsch, Gilles Lacombe, S. Levy PDF

By Francis Hirsch, Gilles Lacombe, S. Levy

This can be a graduate textual content on useful research. After providing the basic functionality areas and their duals, the authors learn issues in operator idea and at last enhance the speculation of distributions as much as major purposes comparable to Sobolev areas and Dirichlet difficulties. alongside the best way, the reader is gifted with a very outstanding collection of good formulated and engaging routines, which try the certainty in addition to indicate many comparable issues. The solutions and tricks that aren't already inside the statements of the workouts are accrued on the finish of the booklet.

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So Ih(y) - h(x)I < Ih(y) - h(xj)I + Ih(x) - h(xj)I < e for all h E H. Examples 1. Every finite subset of C(X) is equicontinuous. 2. Every subset of an equicontinuous set is equicontinuous. 3. A finite union of equicontinuous sets is equicontinuous. 4. Any uniformly convergent sequence of functions in C(X) consitutes an equicontinuous set (exercise). 5. If C is a positive real number, the set of C-Lipschitz functions from X to K is equicontinuous. 2 Let (f,,) be an equicontinuous sequence in C(X) and let D be a dense subset of X.

Prove that Lr is precompact, and finally that so is H. 2 Locally Compact Spaces and Radon Measures In this chapter we study a representation, in terms of measures, of positive linear forms on spaces of continuous functions; this representation leads to a description of the topological dual of such spaces. It is useful in applications to consider functions defined on metric spaces somewhat more general than compact spaces, namely, locally compact ones. 1 Locally Compact Spaces A metric space (X, d) is called locally compact if every point in X has a compact neighborhood; equivalently, if for every x E X there exists a compact K of X whose interior contains x; equivalently, if for every x E X there exists r > 0 such that the closed ball B(x, r) is compact.

Use Exercise 6c on page 5. More directly, if {xn}nEN is an enumeration of Q, the function f defined by f (x) = 0 if x ¢ Q and f (xn) = 1/(n+1) for every n E N has the desired properties. 7. An invariant metric on a vector space E is a metric d on E such that d(x, y) = d(x-y, 0) for all x, y E E. If d is an invariant metric on E, we set IxI = d(x, 0) for x E E. ) A vector 24 Prologue: Sequences space with an invariant metric d is said to have Property (F) if the metric space (E, d) is complete and, for every k E K, the map x H kx is continuous from E to E.

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