The Lattice of Extensions of the Modal Logic of Two Equivalence Relations Has the Cardinality of the Continuum / Izmailov M.M. // Vestnik Moskovskogo Universiteta. Seriya 1. Matematika. Mekhanika. 2011. № 4. P. 46-48 [Moscow Univ. Math. Bulletin. Vol. 72, N 2, 2017. P. 0].

A continuum of different logics over SS5 is constructed. This proves that the cardinality of the lattice of all normal extensions of the logic of two equivalence relations Ext(SS5) is continuum.

Key words: modal logic, fusion of logics, extensions of logics, logic of equivalence relation.

№ 4/2011