Theorem 2. Let E be an open subset of R² and suppose that fe C'(E). Let...
Theorem 10.1.15 (Chain rule). Let X, Y be subsets of R, let xo e X be a limit point of X, and let yo e Y be a limit point of Y. Let f : X+Y be a function such that f(xo) = yo, and such that f is differentiable at Xo. Suppose that g:Y + R is a function which is differentiable at yo. Then the function gof:X + R is differentiable at xo, and .. (gºf)'(xo) = g'(yo)...
2. Let U be an open subset of R and let A be a compact subset of U. Suppose that f: U R is a iction of class C() aud let F-(()e KIf(r, y) 0 and that Df does not vatish on E. Investigate whether Dis a Jordan region. annc
2. Let {xn}nEN be a sequence in R converging to x 0. Show that the sequence R. Assume that x 0 and for each n є N, xn converges to 1. 3. Let A C R". Say that x E Rn is a limit point of A if every open ball around x contains a point y x such that y E A. Let K c Rn be a set such that every infinite subset of K has a limit...
1 Let f: R R be a continuously differentiable map satisfying ilf(x)-FG) ll 리1x-vil, f Rn. Then fis onto 2. f(RT) is a closed subset of R'" 3, f(R") is an open subset of RT 4. f(0)0 or all x, y E 5) S= (xe(-1,4] Sin(x) > 0). Let of the following is true? I. inf (S).< 0 2. sup (S) does not exist Which . sup (S) π ,' inf (S) = π/2 1 Let f: R R be...
3-2. Prove Theorem 3.2. Theorem 3.2 Let I S R be an open interval, xe I, and let f. 8:1\{x} → R be functions. If there is a number 8 > 0 so that f and g are equal on the subset 12 € 7\(x): 13-X1 < 8 of I\(x), then f converges at x iff g converges at x and in this case the equality lim f(x) = lim g(z) holds.
Problem 3. Read about compactness in Section 2.8 of the book. Then, prove, WITHOUT RELYING ON HEINE-BOREL's THEOREM, the following. Let E be a closed bounded subset of E and r be any function mapping E to (0,00). Then there ensts finitely many pints yi E E,i = 1, , N such that i-1 Here Br(y.)(y) is the open ball (neighborhood) of Tudius r(y.) centered at yi. Problem 3. Read about compactness in Section 2.8 of the book. Then, prove,...
This is a tough **Real Analysis** problem, please do it without Heine Borel's theorem & provide as much details as possible Let E be a closed bounded subset of E" and r be any function mapping E to (0,00). Then there exists finitely many pints yi E E, i = 1, . .. ,N such that ECUBvi) Here Bry(yi) is the open ball (neighborhood) of radius r(y) centered at y Let E be a closed bounded subset of E" and...
REAL ANALYSIS Question 1 (1.1) Let A be a subset of R which is bounded above. Show that Sup A E A. (1.2) Let S be a subset of a metric space X. Prove that a subset T of S is closed in S if and only if T = SA K for some K which is closed in K. (1.3) Let A and B be two subsets of a metric space X. Recall that A°, the interior of A,...
Question 2 Let X Pareto(r, 8 = 1) which has pdf: f(x) = 1 , 1 >1 and r > 1 (a) Given a random sample of size n from X show that the mle for r is: r* = 1/7 where Y = SEY and Y = log X (b) Let Y = log X Use the mgf technique (with t <r) to show that: Y Exp(1 = r) [ HINT: My(t) = Eletbox] = E[X“) = * **f(x)dt...
Please answer all parts. Thank you! 20. Let R be a commutative ring with identity. We define a multiplicative subset of R to be a subset S such that 1 S and ab S if a, b E S. Define a relation ~ on R × S by (a, s) ~ (a, s') if there exists an s"e S such that s* (s,a-sa,) a. 0. Show that ~ is an equivalence relation on b. Let a/s denote the equivalence class...