Sets, Relations and Functions
Matching exercise
Match the items on the right to the items on the left.
Empty relation
Universal relation
Reflexive relation
Symmetric relation
relation R in X given by R = φ ⊂ X × X
relation R in X given by R = X × X.
R in X is a relation with (a, a) ∈ R ∀ a ∈ X
R in X is a relation satisfying (a, b) ∈ R implies (b, a) ∈ R.