A few notes on subalgebra lattices. I
Applying some results of graph theory, the author gets a necessary condition for partial unary algebras to have isomorphic (strong) subalgebra lattices. He applies this result to characterize partial monounary algebras with isomorphic (strong) subalgebra lattices and to characterize which lattice is isomorphic to a subalgebra lattice of some partial monounary algebra.
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