On the isomorphisms of the maximum subalgebras of the R. Robinson algebra
Algebra i logika, Tome 6 (1967) no. 3, pp. 91-99
It is proved that the maximum subalgebras of the R. Robinson algebra (if they differ from $\mathfrak{A}_{\{0\}}$) can not be isomorphic to the arbitrary subalgebra of the same algebra and the subalgebra $\mathfrak{A}_{\{0\}}$ is isomorphic to the countable set of its own subalgebras of the special type.
@article{AL_1967_6_3_a9,
author = {V. A. Sokolov},
title = {On the isomorphisms of the maximum subalgebras of the {R.~Robinson} algebra},
journal = {Algebra i logika},
pages = {91--99},
year = {1967},
volume = {6},
number = {3},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/AL_1967_6_3_a9/}
}
V. A. Sokolov. On the isomorphisms of the maximum subalgebras of the R. Robinson algebra. Algebra i logika, Tome 6 (1967) no. 3, pp. 91-99. http://geodesic.mathdoc.fr/item/AL_1967_6_3_a9/