In this note we deal with a question concerning monounary algebras which is analogous to an open problem for partially ordered sets proposed by Duffus and Rival.
机构:
VYSOKA SKOLA STROJNI & TEXT LIBEREC, KATEDRA MATEMAT, CS-46001 LIBEREC 1, CZECHOSLOVAKIAVYSOKA SKOLA STROJNI & TEXT LIBEREC, KATEDRA MATEMAT, CS-46001 LIBEREC 1, CZECHOSLOVAKIA