Practice Definition and Characteristics - 17.2.1 | 17. Irreflexive Relation | Discrete Mathematics - Vol 1
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Practice Questions

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Question 1

Easy

Define an irreflexive relation.

💡 Hint: Think of self-relationships.

Question 2

Easy

What must be true for a relation to be considered symmetric?

💡 Hint: Look for mutual connections.

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Interactive Quizzes

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Question 1

What is an irreflexive relation?

💡 Hint: Look at the pairs in relation.

Question 2

If (a, b) belongs to a symmetric relation, then which of the following must also be true?

  • (b
  • a) is in the relation
  • (a
  • b) is not in the relation
  • None of the above

💡 Hint: Refer back to the definition of symmetry.

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Challenge Problems

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Question 1

Consider the relation R defined on the set A = {1, 2, 3}: R = {(1, 2), (2, 3), (1, 3)}. Is R irreflexive and transitive?

💡 Hint: Check for self-involvement for irreflexivity and chain linking for transitivity.

Question 2

Given the relation R = {(1, 2), (2, 3), (2, 1)}. Determine whether it is symmetric and explain.

💡 Hint: Analyze individual connections for symmetry.

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