Note: If we say R is a relation "on set A" this means R is a relation from A to A; in other words, R⊆A×A. Determine whether the following relation W on a non...Note: If we say R is a relation "on set A" this means R is a relation from A to A; in other words, R⊆A×A. Determine whether the following relation W on a nonempty set of individuals in a community is an equivalence relation: aWb⇔a and b have the same last name.