From the given sets we can tell the following relationsip between the following sets
2. Define the relationships (C, C,), if any, among the following sets: A={x : 0 <...
Let B C R" be any set. Define C = {x € R" | d(x,y) < 1 for some y E B) Show that C is open.
1. Find the supremum and infimum of the following sets. (c) { (a) {, e} (b) (0,1) :n € N} (d) {r EQ : p2 <4} (e) [0, 1] nQ (f) {x2 : x € R} (8) N=1 (1 – 7,1+) (h) U-[2-7-1, 2”)
Suppose X is a continuous random variable having pdf (1+x, -1 < x < 0, f(x) = { 1 – x, 0 < x <1, lo, otherwise (a) Find E(X2). (b) Find Var(X2).
(h) Define f : [0, 2] + R by 122 if 0 <<<1 f(x) = { ifl<152 Using the limit definition of the derivative and the sequence definition of the limit prove that f'(1) does not exist.
Let X be a random variable with CDF z<0 G()=/2 0 <IS2 z>2 1 Suppose Y = X2 is another random variable, find (a) P(1/2 X 3/2), (b) P(1s X< 2) (c) P(Y X) (d) P(X 2Y). (f) If Z VX, find the CDF of Z. (d) P(X+Y 3/4)
(c) A sequence {2n} satisfying 0 < In < 1/n where E(-1)"In diverges.
5. Describe the following sets of real numbers and find the supremum and infimum of these sets: (a) {x}\x2 – 2 <4€R} (b) {x|x+ 2 +13 – x4<4} (©) {x|x<for all neN} 6. For any two elements x and y of an ordered field, prove that _x+ y + x- x + y - x - y (a) max{x,y}=- (b) min{x,y}=-
3. (20pts.) Find the Fourier series of the function given 0- <x<0 x. 0<x<
22: Solve the follwing boundary value problem Ugex - 2 = Utt: 0 < x < 1, t> 0, u(0, 1) = 0, u(1,t) = 0, 0 < x < 1, u(x,0) = x2 - x, ut(x,0) = 1, t > 0. Solve the follwing boundary value problem Uxx + e-3t = ut, 0 < x < t, t > 0, ux(0,t) = 0, unt,t) = 0, t>0, u(x,0) = 1, 0 < x <.
3. (16 points) Suppose that X and Y have the following joint p.d.f. f(x,y) = for 0 < x < y,0 < y <, y 0 otherwise. Compute E[X2]y], the expectation of the conditional distribution of x2 given Y = y.