By P.W. Michor
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Additional info for Functors and Categories of Banach Spaces
Sample text
It remains to show the existence of u, which we present in several steps. First suppose that a(u, v) is symmetric, and define the functional Let d = infiK I(u). Since we see that Letunbeaminimizingsequenceof/in IK such that Applying the parallelogram law, and keeping in mind that IK is convex, w see that We have used Hence the sequence {«„} is Cauchy and the closed set IK contains an element usuchthatu n-u in H and /(«„) -*• /(u). So /(M) = d. Now for any u e IK, u + e(t; — M) e IK, 0 < e < 1, and I(u + e(v — u)) > /(M).
EXERCISES 1. 6. AmappingFfromUNintotRN)'is calledcyclicallymonotone if one has for any set of points (x0,x . . ,xn}(n arbitrary). Show that F(x) = grad /(x) is cyclically monotone if/(x)saC1convex function. 3. 1. (ii) Let F be a continuous mapping of a closed ball "L <=UNintoitself. EXERCISES 19 Assume that the vectorF(x)never has the same direction x forx e dl. Then thereexistsapointx 0ofIwhereF(x0)= x0. 5. we may choosey= F(x therefore F(x0)= x 0 . ) 4. State and solve the complementarity problem when F is a continuous mappingromUNnto(KN)'.
But it is a known variant of Tietze's extension theorem that ueH1'°°(Q) admits an extension to u e HO X(UN)for any bounded open domain Q c UN (cf. the book (Stein [1]), for example). Hence H 1>ao (fl) is dense in //1>S(Q), 1 < s < oo, for any bounded open domain Q. Suppose once again that <3Q is Lipschitz. e. e. in Q0. According to Poincare's inequality, there is a /? 1) for #o(Q). We shall always understand that For 1 < s < oo, Hm's(£l) and //o's(Q) are reflexive Banach spaces and // (Q) and //S(Q) are Hilbert spaces.