 # Exercises 19-20 refer to unions and intersections of relations. Since relations are subsets of Cartesian products, their unions and intersections can be calculated as for any subsets. Given two relations R and S from A to B, R ∪ s = { ( x , y ) ∈ A × B | ( x , y ) ∈ R o r ( x , y ) ∈ S } R ∩ s = { ( x , y ) ∈ A × B | ( x , y ) ∈ R o r ( x , y ) ∈ S } Let A = { 2 , 4 } and B= {6,8,10} and define relations R and S from A to B as follows: For every ( x , y ) ∈ A × B , x ​ R y ⇔ x | y ​ a n d x S y ⇔ y − 4 = x . State explicitly which ordered pairs are in A × B , R , S , R ∪ S , a n d R ∩ S . ### Discrete Mathematics With Applicat...

5th Edition
EPP + 1 other
Publisher: Cengage Learning,
ISBN: 9781337694193 ### Discrete Mathematics With Applicat...

5th Edition
EPP + 1 other
Publisher: Cengage Learning,
ISBN: 9781337694193

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Chapter 8.1, Problem 19ES
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