Homework Answers
OTO (7) (a) Let T = (a1, ..., ak) be a k-cycle in Sn, and let...
OTO (7) (a) Let T = (a1, ..., ak) be a k-cycle in Sn, and let o E Sn. Prove that is the k-cycle (o(a), o(az),..., 0(ak)) (b) Let o,t e Sn. Prove that if t is a product of r pairwise disjoint cycles of lengths k1,..., kr, respectively, where kit..., +kr = n, then oto-1 is also a product of r pairwise disjoint cycles of lengths k1,..., kr. (c) Let T1 and T2 be permutations in Sn. Prove that...
Ok = (6) Let n be a positive integer. For every integer k, define the 2...
Ok = (6) Let n be a positive integer. For every integer k, define the 2 x 2 matrix cos(27k/n) - sin(2nk/n) sin(2tk/n) cos(27 k/n) (a) Prove that go = I, that ok + oe for 0 < k < l< n - 1, and that Ok = Okun for all integers k. (b) Let o = 01. Prove that ok ok for all integers k. (c) Prove that {1,0,0%,...,ON-1} is a finite abelian group of order n.
Let a and b be positive integers, and k an integer with O k<ab. Provide a...
Let a and b be positive integers, and k an integer with O k<ab. Provide a bijective proof for the following identity
5. Let AE Maxn(C). Recall that A is said to be nilpo tent if there exists a positive integer k such that A 0. Prove...
5. Let AE Maxn(C). Recall that A is said to be nilpo tent if there exists a positive integer k such that A 0. Prove the following statements (a) If A is nilpotent, then A 0. (Hint: First show that if A is nilpotent, then the Jordan form of A is also nilpotent.) (b) If A is nilpotent, then tr(A) 0 (e) A is nilpotent if and only if the characteristic polynomial of A is (-1)"" (d) If A is...
Prove: Let k be a positive integer, and set n :=2k-1(2k – 1). Then (2k+1 –...
Prove: Let k be a positive integer, and set n :=2k-1(2k – 1). Then (2k+1 – 1)2 = 8n +1 Prove: Let n be a positive integer, and let s and t be integers. Show that Hire (st) = n(s) in (t) mod n.
n=24 k=4 5. If the third digit in your student ID is odd, let n =...
n=24
k=4
5. If the third digit in your student ID is odd, let n = 24. Otherwise, let n = 12. If the 5th digit in your student ID is odd, let k = 4. Otherwise, let k = 3. Give an example of a nonabelian group G of order n and a subgroup H of order k. Then list all of the cosets of G/H.
2. Let (sn) be a sequence. (a) Prove that limn→oo8n = 0 if and only if...
2. Let (sn) be a sequence. (a) Prove that limn→oo8n = 0 if and only if lim, (b) Is the following statement true: Innn +oosn-s if and only if limn-o ls,1 = Isl. 18ml = 0. du.
(c) contrapositive positiv 2. (a) Prove that for all integers n and k where n >k>0,...
(c) contrapositive positiv 2. (a) Prove that for all integers n and k where n >k>0, (+1) = 0)+2). (b) Let k be a positive integer. Prove by induction on n that ¿ () = 1) for all integers n > k. 3. An urn contains five white balls numbered from 1 to 5. five red balls numbered from 1 to 5 and fiv
3. Let y: K + Aut(H) be a homomorphism. Write (k) = Ok. Let G be...
3. Let y: K + Aut(H) be a homomorphism. Write (k) = Ok. Let G be a group. A function d: K + H is called a derivation if dikk') = d(k) (d(k')). Show that d: K + H is a derivation if and only if V: K + H y K given by v(k) = (d(k), k) is a homomorphism. 4. Suppose that a: G + K is a surjective homomorphism and that 0: K + G is a...
Let P(n) be some propositional function. In order to prove P(n) is true for all positive...
Let P(n) be some propositional function. In order to prove P(n) is true for all positive integers, n, using mathematical induction, which of the following must be proven? OP(K), where k is an arbitrary integer with k >= 1 If P(k) is true, then P(k+1) is true, where k is an arbitrary integer with k >= 1 P(O) P(k+1), where k is an arbitrary integer with k>= 1
OTO (7) (a) Let T = (a1, ..., ak) be a k-cycle in Sn, and let o E Sn. Prove that is the k-cycle (o(a), o(az),..., 0(ak)) (b) Let o,t e Sn. Prove that if t is a product of r pairwise disjoint cycles of lengths k1,..., kr, respectively, where kit..., +kr = n, then oto-1 is also a product of r pairwise disjoint cycles of lengths k1,..., kr. (c) Let T1 and T2 be permutations in Sn. Prove that...
Ok = (6) Let n be a positive integer. For every integer k, define the 2 x 2 matrix cos(27k/n) - sin(2nk/n) sin(2tk/n) cos(27 k/n) (a) Prove that go = I, that ok + oe for 0 < k < l< n - 1, and that Ok = Okun for all integers k. (b) Let o = 01. Prove that ok ok for all integers k. (c) Prove that {1,0,0%,...,ON-1} is a finite abelian group of order n.
Let a and b be positive integers, and k an integer with O k<ab. Provide a bijective proof for the following identity
5. Let AE Maxn(C). Recall that A is said to be nilpo tent if there exists a positive integer k such that A 0. Prove the following statements (a) If A is nilpotent, then A 0. (Hint: First show that if A is nilpotent, then the Jordan form of A is also nilpotent.) (b) If A is nilpotent, then tr(A) 0 (e) A is nilpotent if and only if the characteristic polynomial of A is (-1)"" (d) If A is...
Prove: Let k be a positive integer, and set n :=2k-1(2k – 1). Then (2k+1 – 1)2 = 8n +1 Prove: Let n be a positive integer, and let s and t be integers. Show that Hire (st) = n(s) in (t) mod n.
n=24
k=4
5. If the third digit in your student ID is odd, let n = 24. Otherwise, let n = 12. If the 5th digit in your student ID is odd, let k = 4. Otherwise, let k = 3. Give an example of a nonabelian group G of order n and a subgroup H of order k. Then list all of the cosets of G/H.
2. Let (sn) be a sequence. (a) Prove that limn→oo8n = 0 if and only if lim, (b) Is the following statement true: Innn +oosn-s if and only if limn-o ls,1 = Isl. 18ml = 0. du.
(c) contrapositive positiv 2. (a) Prove that for all integers n and k where n >k>0, (+1) = 0)+2). (b) Let k be a positive integer. Prove by induction on n that ¿ () = 1) for all integers n > k. 3. An urn contains five white balls numbered from 1 to 5. five red balls numbered from 1 to 5 and fiv
3. Let y: K + Aut(H) be a homomorphism. Write (k) = Ok. Let G be a group. A function d: K + H is called a derivation if dikk') = d(k) (d(k')). Show that d: K + H is a derivation if and only if V: K + H y K given by v(k) = (d(k), k) is a homomorphism. 4. Suppose that a: G + K is a surjective homomorphism and that 0: K + G is a...
Let P(n) be some propositional function. In order to prove P(n) is true for all positive integers, n, using mathematical induction, which of the following must be proven? OP(K), where k is an arbitrary integer with k >= 1 If P(k) is true, then P(k+1) is true, where k is an arbitrary integer with k >= 1 P(O) P(k+1), where k is an arbitrary integer with k>= 1
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