3. Supposeis a primitive 12th-root of unity. Then show that ç5,57 and are also primitive 12th-roots...
fekri/n k0,1,...,n-1}, called the nth roots of unity. A primitive root of unity is = eri/n for which 2. The roots off(x) = x"-1 are the n complex numbers Cn and are ged(n, k) 1. It is easy to see that Q(C) is the splitting field of zn - 1. (a) For each n 3,... ,8, sketch the nth roots of unity in the complex plane. Use a different set of axes for each n. Next to each root, write...
Computing another Galois Group a) Let? = eri/6 be a primitive 12th root of unity. Prove that is a zero of the polynomial t4 - t+ 1, and that the other zeros are 55,57,511. b) Prove that t4 – +2 + 1 is irreducible over Q and is the minimal polynomial of over Q.
Problem 2. Let me N so that Zm has a primitive root. Show that it has exactly oſo(m)) primitive roots. Hint: Which powers of the primitive root are primitive roots?
List and graph the 6th roots of unity. What are the generators of this group? What are the primitive 6th roots of unity?
4. Recall that a € ZnZ is called a primitive root modulo n, if the order of a in Z/nZ is equal to on). We have seen in class that, if p is a prime, then we can always find primitive roots modulo p. Find all elements of (Z/11Z)* that are primitive roots modulo 11. 5. Can you find primitive roots modulo 16? Explain your answer. 6. In class, we found 2 primitive roots modulo 9 = 32, namely 2...
6. (16 points) Let CE C be a primitive n-th root of unity. Let X = 6 + 1/5. (a) (4 points) Show that Q(5) R = Q(1). (b) (4 points) Let f be the minimal polynomial of over Q. Show that Q(x) is a splitting field of f over Q. (c) (4 points) Show that Gal(Q(^)/Q) – (Z/nZ)* / (-1). (d) (4 points) Find the minimal polynomial of 2 cos(27/9) over Q.
8. Let g be a primitive root of an odd prime p, and suppose that p3 (mod 4). Show that -g is not a primitive root of p.
8. Let g be a primitive root of an odd prime p, and suppose that p3 (mod 4). Show that -g is not a primitive root of p.
Problem 6. The number 65537 is prime, and 3 is a primitive root. Show what computation would prove 65537 is prime. You do NOT actually have to evaluate any multiplications or finding remainders, just show what the final result of the computation will be, and how many multiplications / divisions it would take.
3) Given the field extensions R c F C C, such that F contains all n'th roots of unity ξ = e2mk/n, k-1, 2,.., n. Let 0メa E F, and let K be the splitting field of /(x) = xn-a E F[a]. T xn-a = 0, and (b) The Galois group G(K, F) is abelian hen show that: (a) K F(u) where u is any root of
3) Given the field extensions R c F C C, such that F...
2. Discrete Fourier Transform.(/25) 1. N-th roots of unity are defined as solutions to the equation: w = 1. There are exactly N distinct N-th roots of unity. Let w be a primitive root of unity, for example w = exp(2 i/N). Show the following: N, if N divides m k=0 10, otherwise N -1 N wmk 2. Fix and integer N > 2. Let f = (f(0), ..., f(N − 1)) a vector (func- tion) f : [N] →...