1. Define a relation on Z by aRb provided a -b a. Prove that this relation...
Let R be the relation defined on Z (integers): a R b iff a + b is even. R is an equivalence relation since R is: Group of answer choices Reflexive, Symmetric and Transitive Symmetric and Reflexive or Transitive Reflexive or Transitive Symmetric and Transitive None of the above
Use mathematical induction to prove that for all n ∈ Z+ 5 + 22 + 39 + · · · + (17n - 12) = n ·(17n - 7)/2 4)(20) The relation R: Z x Z is defined as for a, b ∈ Z, (a, b) ∈ R if a + b is even. Prove all the properties: reflexive, symmetric, anti-symmetric, transitive that relation R has. If R does not have any of these properties, explain why. Is R an...
Let R be the equivalence relation defined by aRb if a^2=b^2 (mod5) . Show that the relation is transitive. Also, determine the distinct equivalence classes.
5. On the set of integers Z define the following relation: "aRb if and only if a - b is a multiple of 7." (1) Prove that R is an equivalence relation. 16 Marks] How many elements are there in the quotient set of 2 with respect to the equivalence relation R? Give reasons. |4 Marks
Let R be the relation defined on Z (integers): a R b iff a + b is even. Suppose that 'even' is replaced by 'odd' . Which of the properties reflexive, symmetric and transitive does R possess? Group of answer choices Reflexive, Symmetric and Transitive Symmetric Symmetric and Reflexive Symmetric and Transitive None of the above
4. Define a function f:N → Z by tof n/2 if n is even 1-(n + 1)/2 if n is odd. f(n) = Show that f is a bijection. 11 ] 7. Let X = R XR and let R be a relation on X defined as follows ((x,y),(w,z)) ER 4 IC ER\ {0} (w = cx and z = cy.) Is R reflexive? Symmetric? Transitive? An equivalence relation? Explain each of your answers. Describe the equivalence classes [(0,0)]R and...
(i) Prove that the realtion in Z of congruence modulo p is an equivalence relation. Namesly, show that Rp := {(a,b) € ZxZ:a = 5(p)} is reflexive, symmetric and transitive. (ii) Let pe N be fixed. Show that there are exactly p equivalence classes induced by Rp. (iii) Consider the relation S E N defined as: a Sb if and only if a b( i.e., a divides b). Prove that S is an order relation. In other words, S :=...
4) Define a relation TC Nx N such that T = {(a,b) a EA A DEA 18- b = 2c+1 for some integer c}. (N is the set of non-negative integers.) a) Prove that this relation is not reflexive. b) Prove that this relation is symmetric. c) Define the term anti-transitive as the following: Given a set A and a relation R, if for all a,b,ceA, (aRb a bRc A cRa) = (a = b v b= c) Prove that...
9. Define R the binary relation on N x N to mean (a, b)R(c, d) iff b|d and alc (a) R is symmetric but not reflexive. (b) R is transitive and symmetric but not reflexive (c) R is reflexive and transitive but not symmetric (d) None of the above 10. Let R be an equivalence relation on a nonempty and finite 9. Define R the binary relation on N x N to mean (a, b)R(c, d) iff b|d and alc...
probelms 9.1 9 Modular arithmetic Definition 9.1 Let S be a set. A relation R = R(,y) on S is a statement about pairs (x,y) of elements of S. For r,y ES, I is related to y notation: Ry) if R(x,y) is true. A relation Ris: Reflexive if for any I ES, R. Symmetric if for any ry ES, Ry implies y Rr. Transitive if for any r.y.ES, Ry and yRimply R. An equivalence relation is a reflexive, symmetric and...