Given:(1) Let R1 and R2 be two transitive relations on a set A. Then, R1 UNION R2 is a transitive relation on A.(2) Let R be the relation x + y = 0 on the set of all real numbers. Then, R is antisymmetric.Select one of the following choices:Question 10Answera.(1) is True and (2) is Falseb.(1) and (2) are Truec.(1) and (2) are Falsed.(1) is False and (2) is True
Question
Given:(1) Let R1 and R2 be two transitive relations on a set A. Then, R1 UNION R2 is a transitive relation on A.(2) Let R be the relation x + y = 0 on the set of all real numbers. Then, R is antisymmetric.Select one of the following choices:Question 10Answera.(1) is True and (2) is Falseb.(1) and (2) are Truec.(1) and (2) are Falsed.(1) is False and (2) is True
Solution
The correct answer is d. (1) is False and (2) is True.
Explanation:
(1) Let R1 and R2 be two transitive relations on a set A. Then, R1 UNION R2 is a transitive relation on A. This statement is false. The union of two transitive relations is not necessarily transitive. For example, consider the set A = {1, 2, 3} with R1 = {(1, 2), (2, 3)} and R2 = {(3, 1)}. Both R1 and R2 are transitive, but R1 UNION R2 = {(1, 2), (2, 3), (3, 1)} is not transitive because (1, 3) is not in the relation.
(2) Let R be the relation x + y = 0 on the set of all real numbers. Then, R is antisymmetric. This statement is true. A relation R on a set A is antisymmetric if for all (a, b) in R where a ≠ b, (b, a) is not in R. In this case, if x + y = 0 and x ≠ y, then y + x = 0, but y ≠ x, so (y, x) is not in R. Therefore, R is antisymmetric.
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