Let a, b, c ∈ Z such that a|b and a|c. Show that a|kb + pc for any k, p ∈ Z.
Exercise 1. Let a, b,CE Z such that alb and alc. Show that alkb + pc for any k, p є z.
3. Let a, b, c E Z such that ca and (a,b) = 1. Show that (c, b) = 1. 4. Suppose a, b, c, d, e E Z such that e (a - b) and e| (c,d). Show that e (ad — bc). 5. Fix a, b E Z. Consider the statements P: (a, b) = 1, and Q: there exists x, y E Z so that ax + by = 1. Bézout’s lemma states that: if P, then...
t2s points). Let B(t) be Brownian motion and let zu) with drift u0. For any B()+ ut be Brownian motion t 0, let T be the first time Z(t) hits a. a) Show that T, is a random time for Z(t) and for B(t). b) Show P(T, 0o)1. c) Use martingale methods to compute E [e-m] for any θ > 0 r> t2s points). Let B(t) be Brownian motion and let zu) with drift u0. For any B()+ ut be...
4. Let f(z) 22. (a) Show thatf is differentiable at z = 0. (b). Show that f is not differentiable at any point z # 0.
Suppose a, b e Z. Show that if a for some integer c E Z, then a or b is even. Hint: Let P, A, and B be respectively the statements P {a2 + b2-c2}, A-fa is even), and B b is even]. In this problem you have to show that P (AVB). Use contradiction, i.e., prove that if the negation of this statement is true, then you come to a contradiction. Use that so that you have to assume...
(P(x),Q(y), R(z)), where P depends only 2. Let S be any surface with boundary curve C, and let F(x,y, z) on r, where Q depends only on y, and where R depends only on z. Show that F.dr 0 C (P(x),Q(y), R(z)), where P depends only 2. Let S be any surface with boundary curve C, and let F(x,y, z) on r, where Q depends only on y, and where R depends only on z. Show that F.dr 0 C
Let f, g E H(C) be such that |f(z)| < \g(z)| for any z e C. Show that there exists a E D(0,1) such that f(z) = ag(z) for any z E C. (Hint: consider f/g and be careful with the zeros of g.)
LLLLLLL 3 Let A, B and C be events with P CA=.6, PCB)=3 PC(= 4 P LAB) =.2 ,PBO-D. P (AC)= 1 Find a P LABHC) BP CAIB) © P (Cible) 2 P LB'IAU
Let X, Y Geometric(p) be independent, and let Z a. Find the range of 2. b. Find the PMF of Z c. Find EZ. Let X, Y Geometric(p) be independent, and let Z a. Find the range of 2. b. Find the PMF of Z c. Find EZ.