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If (a, b) ∈ R, we say that is related to, and we also write aRb. A binary relation from Ato Bis a subset of A B Suppose R A Bis a relation from Ato B. It only takes a minute to sign up. What is a 'relation'? Relations in Discrete Math 1. Active 5 years, 4 months ago. Discrete Mathematics - Recurrence Relation - In this chapter, we will discuss how recursive techniques can derive sequences and be used for solving counting problems. Educators. The objects of the graph correspond to vertices and the relations between them correspond to edges.A graph is depicted diagrammatically as a set of dots depicting vertices connected by lines or curves depicting edges. A recurrence relation is an equation that recursively defines a sequence where the next term is a function of the previous terms (Expressing Fn as some combination of Fi with i