Question

Suppose set A = { 4, 5, 6 } and set B = { 5, 6, 7, 8 }. Relation R from domain A to co-domain B is defined as follows: For a ∈ A and b ∈ B, a R b if (and only if) a ≥ b. Is relation R a function from A to B ? Explain why (or why not).