Exercise 1. Let a, b,CE Z such that alb and alc. Show that alkb + pc...
Let a, b, c ∈ Z such that a|b and a|c. Show that a|kb + pc for any k, p ∈ Z.
Exercise 23. Let φ(z) = z/(1-Iz) for all E (-1,1). (a) Show that p is a bijection from (-1,1) to R. (b) Find φ-1, (By a suitable use of lul, write your answer in the form of a single formula.) Hint: Combine the results of Exercise 20 and part (c) of Exercise 22.)
5. Use mathematical induction to prove that for n 2 1, 1.1! +2.2!+3.3++ n n! (n +1)!-1 7. Prove: If alb and al(b +c) then alc. Prove that for all sets A and B, P(An 6. 8. (a) Find the Boolean expression that corresponds to the circuit 5. Use mathematical induction to prove that for n 2 1, 1.1! +2.2!+3.3++ n n! (n +1)!-1 7. Prove: If alb and al(b +c) then alc. Prove that for all sets A and...
Exercise 2. Let consider a normally distributed random variable Z with mean 0 and variance 1. Compute (a) P(Z < 1.34). (b) P(Z > -0.01). (c) the number k such that P(Z <k) = 0.975.
1. Let a, b,cE Z be positive integers. Prove or disprove each of the following (a) If b | c, then gcd(a, b) gcd(a, c). (b) If b c, then ged(a., b) < gcd(a, c)
Question 4 Exercise 1. Let G be a group such that |G| is even. Show that there exists an EG,17e with x = e. Exercise 2. Let G be a group and H a subgroup of G. Define a set K by K = {z € G war- € H for all a € H}. Show that (i) K <G (ii) H <K Exercise 3. Let S be the set R\ {0,1}. Define functions from S to S by e(z)...
Exercise 25: Let f: [0,1R be defined by x=0 fx)/n, m/n, with m, n E N and n is the minimal n such that z m/n x- m/n, with m,n E N and n is the minimal n such that x a) Show that L(f, P) = 0 for all partitions P of [0, 1]. b) Let m E N. Show that the cardinality of the set A :-{х є [0, 1] : f(x) > 1/m} is bounded by m(m...
Exercise 5.3.4: Let f: [a,b] → R be a continuous function. Let ce [a,b] be arbitrary. Define po the Prove that F is differentiable and that F'(x) = f(x) for all x € [a,b]. series on the
Let Xn = a sin(bn+Z), where n ∈ Z, a, b ∈ [0, ∞) are constant, and Z has a continuous uniform distribution on [−π, π] (i.e. Z ∼ U([−π, π])). Show that Xn is stationary. (Hint: sin(x) sin(y) = 1 2 (cos(x − y) − cos(x + y)) may be helpful). l. Let Xn-a sin(bn+ Z), where n є z, a, b є lo,00) are constant, and Z has a continuous uniform distribution on [-π, π] (i.e. Z ~...