Using Complex Numbers Theorems 3. (a) Let A= {()": n e z} and let {1, 2...
Let z and w be non-zero complex numbers such that zw /=1. Prove that if z= z^(-1) and w=w^(-1),then (z + w)/(1+ zw) is real.I know z * z^(-1) = 1.
answer question 5 please 3 and 4 are just included to refer to the theorems 3 Prove the following theorem: Theorem 2.2. Let S be a ser. The following statements are equivalent: (1) S is a countable set, i. e. there exists an injective function :S (2) Either S is the empty ser 6 or there exists a surjective function g: N (3) Either S is a finite set or there exists a bijective function h: N S (4) Prove...
Let R denote the ring of Gaussian integers, i.e., the set of all complex numbers a + bi with a, b ∈ Z. Define N : R → Z by N(a + bi) = a^2 + b^2. (i) For x,y ∈ R, prove that N(xy) = N(x)N(y). (ii) Use part (i) to prove that 1, −1, i, −i are the only units in R.
complex analysis 6. Let z" f(z)=lim 1 z (a) What is the domain of definition of f, that is, for which compiex numbers z does the limit exist? (b) Give explicitly the values of f(2) for the various z in the domain of f. 6. Let z" f(z)=lim 1 z (a) What is the domain of definition of f, that is, for which compiex numbers z does the limit exist? (b) Give explicitly the values of f(2) for the various...
Definition:In the complex numbers, let J denote the set, {x+y√3i :x and y are in Z}. J is an integral domain containing Z. If a is in J, then N(a) is a non-negative member of Z. If a and b are in J and a|b in J, then N(a)|N(b) in Z. The units of J are 1, -1 Question:If a and b are in J and ab = 2, then prove one of a and b is a unit. Thus,...
Question4 please (1). Let f: Z → Z be given by f(x) = x2. Find F-1(D) where (a) D = {2,4,6,8, 10, 12, 14, 16}. (b) D={-9, -4,0, 16, 25}. (c) D is the set of prime numbers. (d) D = {2k|k Ew} (So D is the set of non-negative integer powers of 2). (2). Suppose that A and B are sets, C is a proper subset of A and F: A + B is a 1-1 function. Show that...
Let p(z) be the principal branch of 21-i. Let D* = C\(-00,0) be all the complex numbers except for the non-positive real numbers. (a) (4 points) Find a function which is an antiderivative of p(x) on D". (b) (6 points) Let I be a contour such that (i) I is contained in D* and (ii) the initial point of I' is 1 and the terminal point of I is i. Compute (2)dr. Justify your answers.
Problem 2. Let n be a positive integer. We sample n numbers ai,...,an from the set 1, 2,...,n} uniformly at random, with replacement. Say that the picks i and j with i < j are a match if a -aj. What is the expected total number of matches? Hint: Use indicators. Wİ
Question 5 [15 marks] The complex numbers z and w are such that w = 1 + a, z =-b-, where a and b are real and positive. Given that wz 3-4, find the exact values of a and b. [7 marks] The complex numbers z and w are such that lz|-2, arg (z)--2T, lwl = 5, arg(w) = 4T. Find the exact values of i. The real part of z and the imaginary part of z ii. The modulus...
ㆍ 3 (10) Let = Re', z = re (0<r< R) be two complex numbers. Show the following identities hold: R2 2 OO = Re = 1 +2 C-z ΣΑ. R2 - 2rR cos (-0)r2 coS n(-e) n=1