atomary tolerance; quasiordering; Boolean algebra
A tolerance on an algebra is defined similarly to a congruence, only the requirement of transitivity is omitted. The paper studies a special type of tolerance, namely atomary tolerances. They exist on every finite algebra.
 S. M. Bogdanović M. D. Ćirić: Polugrupe. Prosveta Niš, 1993. (In Serbo-Croatian.)
 B. Zelinka: Tolerance in algebraic structures
. Czechoslovak Math. J. 20 (1970), 179-183. MR 0260653
| Zbl 0197.01002