http://dspace.nbuv.gov.ua:80/handle/123456789/150376 2026-04-18T14:14:10Z http://dspace.nbuv.gov.ua:80/handle/123456789/158466 Joseph Solomonovich Ponizovskii (1928 – 2012) 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/158465 Leonid Aleksandrovich Shemetkov Ukrainian algebraists with keen sorrow have learned about the death of our colleague, a prominent algebraist and a tremendously efficient science manager of the Republic of Belarus Leonid Aleksandrovich Shemetkov. Leonid A. Shemetkov's entire life was devoted to research and teaching. He was one of the founders of Gomel Algebra School which he had headed for 40 years. For many years, he worked as the President of Francisk Skorina Gomel State University. His excellent achievements were highly praised by his colleagues and the Government: He was elected a Corresponding Member of the National Academy of Sciences of Belarus and he was awarded with the honored title of Distinguished Scientist of Belarus. 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/158443 Rostislav I . Grigorchuk. To the 60th anniversary On February 23, 2013, an outstanding mathematician, one of the founders of our journal Professor Rostislav I. Grigorchuk turns his 60th. The influence of Grigorchuk's famous results on the development of various branches of mathematics is difficult to overestimate and his active involvement in the international mathematics community life is pretty significant. 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/152356 Free n-nilpotent dimonoids Zhuchok, A.V. We construct a free n-nilpotent dimonoid and describe its structure. We also characterize the least n-nilpotent congruence on a free dimonoid, construct a new class of dimonoids with zero and give examples of nilpotent dimonoids of nilpotency index 2. 2013-01-01T00:00:00Z