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If R is symmetric, which statement about R⁻¹ is correct?

Answer and explanation

Correct answer: R⁻¹ = R

The governing concept is the inverse of a relation. If R is a relation from A to A, then R⁻¹ consists of all pairs (b,a) for which (a,b) belongs to R. Symmetry says precisely that whenever (a,b) is in R, its reverse (b,a) is also in R. Thus every pair placed in R⁻¹ is already in R, giving R⁻¹ ⊆ R. Applying the same argument to the reverse direction, or simply reversing the equality, gives R ⊆ R⁻¹ as well. Therefore R⁻¹ = R. The inverse need not be empty, universal, or a proper subset; those descriptions depend on the particular relation.

Related tags

Inverse RelationSymmetric RelationSet EqualityRelationsRelations And FunctionsMathematicsClass 12 Mcq

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