Answer to Question #20079 in Real Analysis for Katherine Peralta

Question #20079
For each of the following relations, indicate whether they are reflexive, symmetric, and transitive (for example select reflexive and transitive if the relation is reflexive and transitive, but not symmetric).

(a) Let R be the relation on N given by xRy if and only if x divides y.

(b) Let X be a set and let R be the relation "⊆" on . In other words, SRT if and only if S⊆T.

(c) Let S be the set of people in the world. Define R on S by xRy if and only if x likes y (use common sense)

(d) Let R be the relation {(1,1), (1,2), (2,2),(1,3),(3,3)} on the set {1,2,3}.

(e) Let R be the relation on R given by xRy if and only if x−y∈Q.

(f) Let R be the relation on R given by xRy if and only if x−y∉Q.

(g) Let R be the relation on R given by xRy if and only if (x−y)2<0.

(h) Let R be the the relation on R given by xRy if and only if |x-y|≤2

(i) Let R be the relation {(1,1), (1,2), (1,3), (2,1), (2,2),(3,1)} on the set {1,2,3}.

(j) Let R be the relation on R given by xRy if and only if xy∈Q.
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Expert's answer
2012-12-04T08:33:38-0500
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