Topology For all s ε 1-1 1], let P1 (s) = 0 and Pn+1(s) = Pn(s) +--Re) for all n > 1. (b) (i) For every n > 1 and Isl-1, show that 0 < pn(s) sl and Pn(s) Pn+1(s) Conclude that(PJnzi converge...
Topology
(b) Let S denote the subset of co consisting of sequences with rational entries of which at most finitely many are nonzero. (i) Show that S is dense in co with the sup norm. [Hint: Show that for every r E co and every ε > 0, there exists y S such that llx-yI100 < ε.j (ii) Conclude that (co, ll . 114) is separable (only quote relevant results) (iii) Show that the closed unit ball in (a-II ·...
Topology
b) Let S denote the subset of co consisting of sequences with rational entries of which at most finitely many are nonzero. (i) Show that S is dense in co with the sup norm. [Hint: Show that for every r E co and every e >0, there exists y E S such that llr- yllle (ii) Conclude that (co, l is separable (only quote relevant results) (ii) Show that the closed unit ball in (coIl lis not compact. [Hint:...
5. [20+5+5] In the regression modely, x,B+ s, pe,+u, ,where I ρ k l and , , let ε, follow an autoregressive (AR) process u' ~ID(Qơ:) , t-l, 2, ,n . <l and u, - Derive the variance-covariance matrix Σ of (q ,6, , , ε" )". From the expression of Σ, identify and interpret Var(.) , t-1, 2, , n . Find the CorrG.ε. and explain its behavior as "s" increases, (s>0). (ii) (iii)
5. [20+5+5] In the regression...
Let f, (x) := lxl1+1/n, Π ε N, and f(x) 비파 Show Exercise 13: a) fn-f uniformly on all bounded intervals (a, b) C R. b) fn -f is not uniformly on all of R.
Let f, (x) := lxl1+1/n, Π ε N, and f(x) 비파 Show Exercise 13: a) fn-f uniformly on all bounded intervals (a, b) C R. b) fn -f is not uniformly on all of R.
a) Show that the series CO (e n 0 n 0 on the interval 10, co towards the function Converges pointwise 1 t e]0, co[ f(t) 1 — е- b) Show that the series CO пе-nt п3D0 converges uniformly for t in the interval [b, o for every constant b > 0. Let CO ne nt t> 0, s(t) n 1 be the sum function of the series. J0, co[ d) Show thatf'(t) = -s(t) for all t > 0...
Let y = Xß + ε where ε ~ N(0, σ21). Let β = (XTX)-"XTy and let è-y-X β. (a) Show that è-(1-Pxje where Px (b) Compute Ee -e 2. X(XTX)-1x" (1 (c) Compute Varle-e.
Let y = Xß + ε where ε ~ N(0, σ21). Let β = (XTX)-"XTy and let è-y-X β. (a) Show that è-(1-Pxje where Px (b) Compute Ee -e 2. X(XTX)-1x" (1 (c) Compute Varle-e.
Example 2.1.4 A counterexample. Let with probability 1-Pn 7L n with probability Pn Then Yn--1, provided Pn → 0 (Problem 1.2(i). On the other hand, E(%) = (1-m) + npn which tends to a if Pn = a/n and to oo if, for example, Pn = 1/vn. This shows that (i) need not hold, and thati) need not hold is seen analogously (Problem 1.2( 1.2 In Example 2.1.4, show that p (i) Y, 1 if Pn → 0; (ii) EK,-,...
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Exercise 25: Let f 0,R be defined by f(x)-1/n, m, with m,nENand n is the minimal n such that m/n a) Show that L(f, P)0 for all partitions P of [0, 1] b) Let mE N. Show that the cardinality of the set A bounded by m(m1)/2. e [0, 1]: f(x) > 1/m) is c) Given m E N construct a partition P such that U(f, Pm)2/m. d) Show that f is integrable and compute Jo...
7.10 please
e) divergence at I = -5? Exercise 7.10. Show that if the sequence and is bounded then the power series > .7 n=0 converges absolutely for p<1. Exercise 7.11. Let A be a set of real numbers with the following property: For every real number Il i) if I, E A then I e A for every I such that I< 1:1), and ii) if I & A then I ¢ A for every I such that :|...
Let po, P1, ...,Pn be boolean variables. Define ak = (Pk + (ak-1)), where ao = po. Prove the following boolean-algebra identity using proof by induction and the rules of boolean algebra (given below). Poan = po, for all n > 1. Equivalently this can be written out as: po · (Pn + (Pn-1 +...+(p2 + (p1 + po)...)) = po, for all n > 1. (p')=P (a) Commutative p.q=qp p+q = 9+p (b) Associative (p. 9).r=p.(q.r) (p+q) +r=p+(q +...