Fact: If d > 2 is an integer, then there exists a prime q such that...
8. (a) Prove that if p and q are prime numbers then p2 + pq is not a perfect square. (b) Prove that, for every integer a and every prime p, if p | a then ged(a,pb) = god(a,b). Is the converse of this statement true? Explain why or why not. (c) Prove that, for every non-zero integer n, the sum of all (positive or negative) divisors of n is equal to zero. 9. Let a and b be integers...
4. An element a in a ring R is called nilpotent if there exists a non-negative integer n such that a" = OR (a) Let a and m > O be integers such that if any prime integer p divides m then pſa. Prove that a is nilpotent in Zm. (b) Let N be the collection of all nilpotent elements of a ring R. Prove that N is an ideal of R. (c) Prove that the only nilpotent element in...
1 For each of the following pairs of numbers a and b, calculate and find integers r and s such ged (a; b) by Eucledian algorithm that gcd(a; b) = ra + sb. ia= 203, b-91 ii a = 21, b=8 2 Prove that for n 2 1,2+2+2+2* +...+2 -2n+1 -2 3 Prove that Vn 2 1,8" -3 is divisible by 5. 4 Prove that + n(n+1) = nnīYn E N where N is the set of all positive integers....
1. Let m be a nonnegative integer, and n a positive integer. Using the division algorithm we can write m=qn+r, with 0 <r<n-1. As in class define (m,n) = {mc+ny: I,Y E Z} and S(..r) = {nu+ru: UV E Z}. Prove that (m,n) = S(n,r). (Remark: If we add to the definition of ged that gedan, 0) = god(0, n) = n, then this proves that ged(m, n) = ged(n,r). This result leads to a fast algorithm for computing ged(m,...
Let q be a prime and let m and n be non-zero integers. Prove that if m and n are coprime and q? divides mn, then q? divides m or q? divides n
number thoery just need 2 answered 2. Let n be a positive integer. Denote the number of positive integers less than n and rela- tively prime to n by p(n). Let a, b be positive integers such that ged(a,n) god(b,n)-1 Consider the set s, = {(a), (ba), (ba), ) (see Prollern 1). Let s-A]. Show that slp(n). 1. Let a, b, c, and n be positive integers such that gcd(a, n) = gcd(b, n) = gcd(c, n) = 1 If...
Question 3 (a) Write down the prime factorization of 10!. (b) Find the number of positive integers n such that n|10! and gcd(n, 27.34.7) = 27.3.7. Justify your answer. Question 4 Let m, n E N. Prove that ged(m2, n2) = (gcd(m, n))2. Question 5 Let p and q be consecutive odd primes with p < q. Prove that (p + q) has at least three prime divisors (not necessarily distinct).
answer all parts please 1. (12 points) Prove that if n is an integer, then na +n + 1 is odd. 2. (12 points) Prove that if a, b, c are integers, c divides a +b, and ged(a,b) -1, then god (ac) - 1. 3. (a) (6 points) Use the Euclidean Algorithm to find ged(270, 105). Be sure to show all the steps of the Euclidean algorithm and, once you have finished the Euclidean Algorithm, to finish the problem by...
(For this question, do not use prime factorization) Suppose that a, b and d are positive integers with d ab. Prove that there exists positive integers e and f such that ea, f b and d= ef. Further show that the values of e and f are unique if (a, b) = 1.
Problem 11. Prove via induction that every integer n 2 can be expressed as a product of prime mumbers. You may use without proof that if n 2 2 is no such that n ab. t prime, then there exists integers a, b2 2 Problem 11. Prove via induction that every integer n 2 can be expressed as a product of prime mumbers. You may use without proof that if n 2 2 is no such that n ab. t...