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Download e-book for kindle: A First Course in Functional Analysis by Orr Moshe Shalit

By Orr Moshe Shalit

ISBN-10: 1498771610

ISBN-13: 9781498771610

Written as a textbook, A First path in sensible Analysis is an creation to easy useful research and operator concept, with an emphasis on Hilbert house tools. the purpose of this ebook is to introduce the elemental notions of practical research and operator concept with out requiring the coed to have taken a path in degree thought as a prerequisite. it really is written and established the best way a direction will be designed, with an emphasis on readability and logical improvement along genuine purposes in research. The heritage required for a scholar taking this direction is minimum; uncomplicated linear algebra, calculus as much as Riemann integration, and a few acquaintance with topological and metric spaces.

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Extra info for A First Course in Functional Analysis

Example text

The space L2 [a, b] can be defined in a completely different manner, in rather concrete function-theoretic terms, as the space of square integrable Lebesgue measurable functions on the interval (to be precise, equivalence classes of square integrable Lebesgue measurable functions). This is the way this space is defined in a course in measure theory, and is in fact how it is usually defined; we refer the reader to either [11] or [29] for the standard treatment. After one defines the space L2 [a, b], one can define the inner product on it using the Lebesgue integral.

1) together with Cauchy-Schwarz implies that { fn , gn }∞ n=1 is a Cauchy sequence Hilbert spaces 21 of complex numbers. ). 1. For example, if h ∈ H, let G ∋ fn → h. Then h, h = lim fn , fn ≥ 0. Moreover, if h, h H = 0, then fn − 0 2 = fn , fn → 0. Thus fn converges to 0 in G ⊆ H. But fn converges to h in H, therefore, by uniqueness of the limit in H, h = 0. By this point, we know that H is a complete metric space which also has the structure of an inner product space. To show that H is a Hilbert space, we need to show that the inner product induces the metric of H.

2. The vector spaces arising in functional analysis are (usually) either the real numbers R or the complex numbers C. In this text, we shall consider mostly complex spaces, that is, spaces over C; this will keep statements clean. Almost all of the results discussed in this book hold equally well for real Hilbert spaces with similar proofs. We will try to take note of instances where the fact that we are working over C makes a difference. Henceforth G will denote an inner product space. Sometimes we will denote the inner product f, g G for emphasis.

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A First Course in Functional Analysis by Orr Moshe Shalit

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