Prove or give a counterexample: For any integers b and c and any positive integer m, if b ≡ c (mod m) then b + m ≡ c (mod m).
Prove or give a counterexample: For any integers b and c and any positive integer m,...
Give a proof or counterexample, whichever is appropriate. 1. For any sets A and B, (A ∩ B = ∅) AND (A ∪ B = B) ⇒ A = ∅ 2. An integer n is even if n2 + 1 is odd. 3. The converse of the assertion in exercise 62 is false. 4. For all integers n, the integer n2 + 5n + 7 must be positive. 1.65. For all integers n, the integer n4 + 2n2 − 2n...
Let m be a positive integer and let a and b be integers relatively prime to m with (ord m a , ord m b) )=1. Prove that ord m (ab)= (ord m a) (ord m b) (Hint: Let k=ord m(a),l=ord m(b), and n=ord m(ab). Then 1≡(ab)^kn≡b^kn mod m. What does this imply about l in relation to kn?
1. [10 marks] Modular Arithmetic. The Quotient-Remainder theorem states that given any integer n and a positive integer d there exist unique integers q and r such that n = dq + r and 0 r< d. We define the mod function as follows: (, r r>n = qd+r^0<r< d) Vn,d E Z d0 Z n mod d That is, n mod d is the remainder of n after division by d (a) Translate the following statement into predicate logic:...
(d)n- 1013 2. Let a, b, c, d be integers. Prove the statement or give a counterexample (a) If (ab) c, then a |c and alc. (b) If a l b and c|d, then ac bod (c) If aYb and alc, then aYbc. (d) If a31b4, then alb. (e) If ged(a, b) 1 and alc and b c, then (ab) c. Here a and b are relatively prime integers, also called coprime integers.] rherF and r is an integer with...
Is any subgraph of a bipartite always bipartite? Prove, or give a counterexample.
If m and n are coprime positive integers, prove that φ(n) no(m)-1 (mod mn).
5. (a) Show that 26 = 1 mod 9. (b) Let m be a positive integer, and let m = 6q+r where q and r are integers with 0 <r < 6. Use (a) and rules of exponents to show that 2" = 2 mod 9 (c) Use (b) to find an s in {0,1,...,8} with 21024 = s mod 9.
Let m be a positive integer. Show that a mod m - b mod m t a - b (mod m) Drag the necessary statements and drop them into the appropriate blank to build your proof (mod m Dag the mecesary eemnes a ohem int the approprite Proof method: Proof assumptions), at-qm + Proof by contradiction aaandh mam it Implication(s) and deduction(s) resulting from the assumption(s): a mk + bmk Hqm tr a-(k + q)m+ r Conclusion(s) from implications and...
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.
5.Prove Proposition. Suppose that a, -a and bb and a>b. Then there is a positive integer M such that ifp2 M and q 2 M then a >b Suggestions to get you started 0. It is easier to use a direct proof. Do not try to prove this one by contradiction. 0'. Draw the picture of the situation 1. Since a< b, what does the Hausdorff Lemma say? Draw the real line showing what the Hausdorff Lemma sets up for...