Download Introduction to Functional Analysis by Angus E. Taylor PDF

By Angus E. Taylor

ISBN-10: 0898749514

ISBN-13: 9780898749519

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76) Hilbert Spaces Equipping RN with a dot product enhanced its structure by introducing the notion of orthogonality. This prompts us to define the general notion of an inner product on a linear space. 10. Let X be a real linear space. ) x, x X > 0 iff x = 0. The pair (X, ·, ·· X ) is called a (real) inner product space. 49). ) C ([a, b] ; R) equipped with f,g C= ˆ b f (t)g(t)dt. 77). ) W2,m (a, b; R) equipped with f,g W2,k = ˆ b f (t)g(t) + f ′ (t)g′ (t) + . . + f (m) (t)g(m) (t) dt. 10. 78) are inner products.

Let c ∈ R and assume that lim xn = L and lim yn = M. ) lim (xn − yn ) = L − M. n→∞ The following lemma can be proven easily using induction. 10. If {nk } ⊂ N is an increasing sequence, then nk ≥ k, ∀k ∈ N. 11. If lim xn = L and xnk is any subsequence of {xn } , then n→∞ lim xnk = L . ) Outline of Proof: Let ε > 0. There exists N ∈ N such that |xn − L| < ε , ∀n ≥ N. 10 to infer that k ≥ K0 =⇒ nk > k ≥ K0 ≥ N =⇒ xnk − L < ε . ) The conclusion now follows. 5. Prove that if lim xn = 0 and {yn } is bounded, then lim xn yn = 0.

7. 4. Prove Props. 8. 5. Assume that gn −→ g uniformly on [a, b] and that f is uniformly continuous on [a, b]. Prove that f (gn ) −→ f (g) uniformly on [a, b]. © 2011 by Taylor & Francis Group, LLC 37 A Basic Analysis Toolbox Remark. Taylor series representations of infinitely differentiable functions are presented in elementary calculus. Some common examples are N xn ∑ , x ∈ R, N→∞ n=0 n! 71) N (−1)n x2n+1 , x ∈ R, n=0 (2n + 1)! 72) N (−1)n x2n , x ∈ R. n=0 (2n)! 73) It can be shown that the convergence in each case is uniform on all compact subsets of R.

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