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Download e-book for iPad: An introduction to functional analysis by Charles Swartz

By Charles Swartz

ISBN-10: 0824786432

ISBN-13: 9780824786434

In accordance with an introductory, graduate-level path given via Swartz at New Mexico country U., this textbook, written for college kids with a reasonable wisdom of element set topology and integration concept, explains the foundations and theories of practical research and their functions, exhibiting the interpla

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20). However, we show in Proposition 10 below that any quasi-normed . if-space is a X-space. We will see later that 4-spaces are useful in obtaining uniform boundedness principles (§9). Proposition 10. if-space, then X is a X-space. Proof. Let xk -+ 0 in X. 5). is bounded (Exer. 5) and, therefore, X bounded. Thus, {t k(tkxk) } = { xk } is X convergent. Bounded Sets in a TVS 42 Exercise 1. Show that a finite set is bounded. Exercise 2. Show a compact subset of a TVS is bounded. Exercise 3. Show that a subset of a bounded set is bounded.

N n If q(x) = q(-x) and x = n - xk and k=1 k=1 n q(xk) = k=1 so I xk, then -x = q(-xk) k=1 lxI = I-XI. Lemma 2. Let X be a vector space and q a non-negative function of X such that q(0) = 0 and q(x +- y + z) 5 2 max (q(x), q(y), q(z) } . , xn a X, q( xi) S 2 i=1 q(xi). i=1 n Proof: Set a = q(xi), where we may assume a > 0. The proof i=1 is by induction on n. For n = 1, 2, 3, the result is trivial so assume that m n > 3. Let m be the largest integer such that q(xi) 5 a/2 [if this i=1 inequality fails to hold for m = 1, set m = 0 and ignore this inequality].

6). If IIxII * 0, x/IIxII e S so IITxII/IIxII 5 M and (*) holds; if IIxII = 0, then (*) holds since IITxII = 0 [(nx : n E IN) is bounded so sup{nhlTxll : n E IN) < -]. Assume (v) holds. Let 8 > 0. Set 5 = &(M. If Ilx - yll < S, IIT(x - y)II = IITx - Tyll s Mllx - yII < e and (i) holds. Definition 6. Let X, Y be TVS over F. L(X, Y) denotes the space of all linear, continuous mappings (called operators from X into Y. L(X, Y) is a vector space under the pointwise operations of addition and scalar multiplication.

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