Correspondence itself is a relation between two structures, such as base and reduplicant (B-R) or input and output (I-O). To simplify the discussion, we focus on correspondence between strings. (1) Correspondence: Given two strings S1 and S2, "correspondence is a relation ℜ from the elements of S1 to those of S2. Elements αε S1 and βε S2 are referred to as "correspondents" of one another when αℜβ.
- McCarthy & Prince (2004), a pag.373