9th International Summer School on Aggregation Functions (AGOP), Skovde, Sweden, 19 - 22 June 2017, vol.581, pp.154-161
In this paper, we define the set I-F((x)), denoting the set of all incomparable elements with arbitrary but fixed x is an element of (0, 1) according to F-partial order and this set is deeply investigated. Then, an equivalence relation on the class of nullnorms induced by a F-partial order is defined and discussed. Finally, we give an answer to a recently posed open problem.