Practice Examples of Transitive Relations - 17.5.2 | 17. Irreflexive Relation | Discrete Mathematics - Vol 1
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Practice Questions

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Question 1

Easy

Is the relation R = {(1, 1), (2, 3)} irreflexive?

💡 Hint: Recall that an irreflexive relation cannot contain (a, a).

Question 2

Easy

Is R = {(1, 2), (2, 1)} symmetric?

💡 Hint: Check if both directional relations are included.

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Interactive Quizzes

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Question 1

What is an irreflexive relation?

  • A relation where some elements relate to themselves
  • A relation where no elements relate to themselves
  • A relation with all elements relating to each other

💡 Hint: Recall the definition of irreflexive.

Question 2

True or False: Every symmetric relation is also antisymmetric.

  • True
  • False

💡 Hint: Think about how symmetry contradicts antisymmetry.

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Challenge Problems

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Question 1

Given a relation R = {(1, 2), (2, 1), (2, 3)}, determine if R is symmetric, antisymmetric, or both.

💡 Hint: Examine the conditions set by the definitions.

Question 2

If a relation defined on a set A is both symmetric and antisymmetric, under what conditions does this occur?

💡 Hint: Think about how each definition constrains relationships.

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