10. Let a and b be natural numbers that are co-prime. Prove that (b-a) and b...
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...
7.23 Theorem. Let p be a prime congruent to 3 modulo 4. Let a be a natural number with 1 a< p-1. Then a is a quadrutic residue modulo pif and only ifp-a is a quadratic non-residue modulo p. 7.24 Theorem. Let p be a prime of the form p odd prime. Then p 3 (mod 4). 241 where q is an The next theorem describes the symmetry between primitive roots and quadratic residues for primes arising from odd Sophie...
3 Let p and q be prime numbers and let G be a non-cyclic group of order pq. Let H be a subgroup of G.Show that either H is cyclic or H-G. 12 - Let I and J, be ideals in R. In, the homomorphismJ f: (!+J a → a+J use the First Isomorphism Theorem to prove that I+J
please prove proofs and do 7.4 7.2 Theorem. Let p be a prime, and let b and e be integers. Then there exists a linear change of variahle, yx+ with a an integer truns- farming the congruence xbx e0 (mod p) into a congruence of the farm y (mod p) for some integer 8 Our goal is to understand which integers are perfect squares of other inte- gers modulo a prime p. The first theorem below tells us that half...
19. Let p be the nth prime number (so pi 2, p2 3, ps 5, and so on). (a) Prove that Pr#Q(VP, VP2,.. P-1. [Hint: Use a proof by induction on QVPI VP2, VPn-1) and Fo QPI, VP2VP). (b) Deduce that Q(VPi, VP2 (e) Deduce that Q(PIp 2 2 is a prime) is an Use F-1 , VPn) Q2" for all positive integers . algebraic extension of Q of infinite degree. [This Exercise is motivated by [54].]
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).
Bonus: Prove that the Q-linear space R is not spanned by any finite set of vectors. Hint: As a first step, prove that for all n E N the set In p1, In p2, . denotes the sequence of prime numbers (2,3,5, 7, 11, 13, 17, 19,...) and In is the natural log. ,..., In pn is linearly independent, where pi, P2, P3, . ..
please post clear picture or solution. Bonus question: 4 bonus marks] A positive integer r is called powerful if for all prime numbers P, p implies p | r. A positive integer z is called a perfect power if there exist a prime number p and a natural number n such that p". An Achilles number is one that is powerful but is not a perfect power. For example, 72 is an Achilles number. Prove that if a and b...
Let p be a prime >0. Prove that 12,23 (21) gives a set of different remainders modulus p. Also prove that for every number a with pla, a is congruent to one and only one of the element in the previous set. Let p be a prime >0. Prove that 12,23 (21) gives a set of different remainders modulus p. Also prove that for every number a with pla, a is congruent to one and only one of the element...
a and b are answered so they can be used to solve c (solve only c) #6.2 a) Let f : I → I be a differentiable function. x be a point in 1, and k be a natural number. Prove that Hint: Use the chain rule and mathematical induction. b) Let {pi,P2,... ,Pn) be the orbit of a periodic point with pe- riod n. Use part (a) to prove p1 is an attracting hyperbolic peri- odic point if and...