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Show that the relation R in …

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Show that the relation R in the set Z of all integers given by R{(a, b) : 5 divides a-b} is an equivalence Relation
  • 1 answers

Jerry Singh 4 years, 3 months ago

For every a in Z, We have (a-a) which is divisible by 5 So, (a, a) is in R Hence, R is reflexive Let (a, b) be in R then (a-b) =5k(say) And, - (a-b) is also divisible by 5 Hence,( b-a) is divisible by 5 Therefore, (b, a) is in R whenever (a, b) is in R So, R is symmetric Let (a,b) and (b,c) be in R. Then, (a-b) is divisible by 5, also (b-c) is divisible by 5. Now, (a-b) +(b-c) =(a-c) is also divisible by 5. Hence,(a,c) is in R whenever (a, b) and (b, c) is in R. So, R is transitive Since, R is reflexive, symmetric and Transitive Thus, R is an equivalence relation.
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