Geodesic
Abstract characterization of semigroups of input signals of universal planar automata
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 15 (2015) no. 1, pp. 113-121.

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Universal planar automata are universally attracted objects in the category of automata, for which sets of states and output signals are endowed with structures of planes. The main results of the paper give us necessary and sufficient conditions under which an arbitrary automaton is isomorphic to a universal planar automaton and an arbitrary semigroup is isomorphic to the semigroup of input signals of a universal planar automata. 
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V. A. Molchanov. Abstract characterization of semigroups of input signals of universal planar automata. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 15 (2015) no. 1, pp. 113-121. http://geodesic.mathdoc.fr/item/ISU_2015_15_1_a15/

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