V článku je studována Levinova kongruence na strukturách indukovaných akcemi polohypergrup a hypergrup rozličných operátorů. (cs)
In the paper there is investigated the Levine's congruence on structures induced by actions of semihypergroups and hypergroups of various operators.
In the paper there is investigated the Levine's congruence on structures induced by actions of semihypergroups and hypergroups of various operators. (en)