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  • 1 Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
  • | 2 Pedagogical University, 21100 Vinnitsa, Ukraine
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It is proved that the set of all idempotent operations defined on a given set forms a Menger algebra which can be characterized by its densely embedded v-ideal. We also describe automorphisms of this algebra.

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