P-stable polygons are studied. It is proved that the property of being (P, s)-, (P, a)-, and (P, e)-stable for the class of all polygons over a monoid S is equivalent to S being a group. We describe the structure of (P, s)-, (P, a)-, and (P, e)-stable polygons SA over a countable left zero monoid S and, under the condition that the set A \ SA is indiscernible, over a right zero monoid.
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Translated from Algebra i Logika, Vol. 56, No. 4, pp. 486-505, July-August, 2017.
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Stepanova, A.A., Ptakhov, D.O. P-Stable Polygons. Algebra Logic 56, 324–336 (2017). https://doi.org/10.1007/s10469-017-9453-6
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DOI: https://doi.org/10.1007/s10469-017-9453-6