Domain of Relation

Domain of relation

Let R be a relation from a set A to a set B. Then the of all first components or coordinates of the ordered pairs belonging to R is called the domain of R.

Thus, domain of R = { a : (a, b) ∈ R}
Clearly, domain of R ⊆  A
If A = {1, 3, 5, 7},  B = {2, 4, 6, 10} and R = {(1, 8), (3, 6), (5, 2), (1, 4)} is a relation from A to B, then
Domain( R) = {1, 3, 5}

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