Abstract:
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.