Since this expression holds for all e, we must have fESSr. 25. Since fn

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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Since this expression holds for all e, we must have fESSr.
25. Since fn <f on E for all n, we know that In SL. Thus lim sup f In <, I. which along with
Fatou's Lemma implies lim, Se fn = JA
26. Let fn = X(-x,-n}- Then f, converges downward to f = 0 but lim, S fn = x +0 = S f.
27. Let gn = infr>n fk. Then {gn} is an increasing sequence of non-negative, measurable functions on E
that converges pointwise on E to lim inf fn. By the Monotone Convergence Theorem, we know that
Sp lim inf fn = lim,+ Se 9n. But since g, < fn: we also know that Se 9n < Se fn for all n. Therefore
lim.
Co la < lim inf C. fa. Combining these results, we can conclude
Transcribed Image Text:Since this expression holds for all e, we must have fESSr. 25. Since fn <f on E for all n, we know that In SL. Thus lim sup f In <, I. which along with Fatou's Lemma implies lim, Se fn = JA 26. Let fn = X(-x,-n}- Then f, converges downward to f = 0 but lim, S fn = x +0 = S f. 27. Let gn = infr>n fk. Then {gn} is an increasing sequence of non-negative, measurable functions on E that converges pointwise on E to lim inf fn. By the Monotone Convergence Theorem, we know that Sp lim inf fn = lim,+ Se 9n. But since g, < fn: we also know that Se 9n < Se fn for all n. Therefore lim. Co la < lim inf C. fa. Combining these results, we can conclude
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