Consider the function φ : R- (a) What is ф(6)? (b) What is(-3)? (c) What is...
(i) Determine whether ф defines a hornom Orphism. (ii) Find ker ф :-0€ G | ф(G) e} and in ф ф(G). (ii) Draw Cayley diagrams of the domain and codomain, and arrange them so one can "visually see" the cosets of ker ф in G. Draw dotted lines around these cosets. (iv) Is the quotient G/kero a group? If so, what is it isomorphic to? Z, defined by ф(n) n (mod 3). Here is an example of Step (iii) for...
(i) Determine whether φ defines a homomorphism. (ii) Find ker ф :-(g E G I ф(G)-e) and inn ф d(G). (ii) Draw Cayley diagrams of the domain and codomain, and arrange them so one can "visually see" the cosets of ker φ in G. Draw dotted lines around these cosets. (iv) Is the quotient G/ker ф a group? If so, what is it isomorphic to? Here is an example of Step (iii) for the map o: Z6 Z3, defined by...
Question 3. Separation of variables Consider Laplace's Equation in two dimensions (a) Write Ф(r,y)-F(x)G(y) and use separation of variables to get ordinary differential equa- tions for F and G (b) Consider the rectangular region {(x, y) E R2: 0Ka, 0 y b with three boundary conditions on Ф об obtain conditions on F and G on those boundaries where conditions on Ф are given (c) (i) Solve the differential equations found in (a), subject to the conditions found in (b)...
3. In spherical coordinates the unit vectors r, and ф are given by (a) Compute the cross products #x f, #x θ, PX φ, θ 0, θ >< φ, and φ >< φ. (b) Express x, y and z in terms of, О and ф. (c) Check the divergence theorern for the function u = r , using for volume the sphere of radius 13] R, centered at the origin, i.e. show that dä -JyV-üö)dr.
3. Consider the function defined by f(x) = 1, 0 < r< a, | 0, a< x < T, where 0a < T (a) Sketch the odd and even periodic extension of f (x) on the interval -3n < x < 3« for aT/2 (b) Find the half-range Fourier sine series expansion of f(x) for arbitrary a. (e) To what value does the half-range Fourier sine series expansion converge at r a? [8 marks 3. Consider the function defined by...
Question 3. Separation of variables. Consider Laplace's Equation in two dimensions: (a) Write Φ(x,y) F(x)G(y) and use separation of variables to get ordinary differential equa- tions for F and G (b) Consider the rectangular region {(x,y) є R2 : 0 a, 0-y-b} with three boundary x conditions on Ф: obtain conditions on F and G on those boundaries where conditions on Ф are given. (c) (i) Solve the differential equations found in (a), subject to the conditions found in (b)...
13. (i) For each of the following equations, find all the natural numbers n that satisfy it (a) φ(n)-4 (b) o(n) 6 (c) ф(n) 8 (d) φ(n) = 10 (ii) Prove or disprove: (a) For every natural number k, there are only finitely many natural num- bers n such that ф(n)-k (b) For every integer n > 2, there are at least two distinction integers that are invertible modulo n (c) For every integers a, b,n with n > 1...
11 Consider the one-dimensional oscillator defined on page 6. At time t function (r, t is given by 0, its wave (a, 0) N{(2+3i)óo(a) - V/5¢2(x) + (2 - i/3)()} (a) Choose N such that Į is normalised to 1. [2] (b) What are the allowed energies, and with what probabilities? (c) What is the wave function at time t? [] What is the probability for even parity to be measured? Briefly explain (d) [I] explicit expression for a_ V...
(b) Let D C C be a regular domain, f : D → D' C C be a complex-valued function and f(z) = u(x,y) + iv(x,y). (a) Show that if/(z) is differentiable on D implies the Cauchy-Riemann equation, i.e., au dyJu on D. (b) Assume that D- f(D).e. fis a conformal mapping from domain D onto domain D. Le x' =a(x,y), y = r(x,y). Show that if φ(x,y) is harmonic on D. ie..知+Oy-0, then is also harmonic on domain D....
Every ring in this test is commutative with 1 and 1 0 1. Which of the followings are prime ideals of Z? (Separate your answers by commas.) A. ( B. (2). C. (9). D. (111). E. (101) 2. Which of the followings are ring homomorphisms? (Separate your answers by commas.) A.φ: Z → Z, defined by (n) =-n for all n E Z B. ф: Z[x] Z, defined by ф(p(z)) p(0) for all p(z) E Z[2] C. : C C....