ON SOME CLASSES OF GOOD QUOTIENT RELATIONS 1
... Example 6. Let A = {a, b, c, d, 1, 2, 3, 4}, A = hA, f i where f : A2 → A is
defined in the following way:
f (a, c) = 1, f (b, c) = 2, f (a, d) = 3, f (b, d) = 4 and f (x, y) = 1 for all other
(x, y) ∈ A2 .
If R = {(a, b), (1, 2), (3, 4)} ∪ ∆, S = {(c, d), (1, 3), (2, 4)} ∪ ∆, then R, S ∈
BQConA, R ...