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Vladimir Boltyansky, Russian mathematician, educator and author (died 2019)
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Vladimir Boltyansky
Soviet and Russian mathematician, educator, and author (1925–2019)
Vladimir Grigorevich Boltyansky, also transliterated as Boltyanski, Boltyanskii, or Boltjansky, was a Soviet and Russian mathematician, educator and author of popular mathematical books and articles. He was best known for his books on topology, combinatorial geometry and…Source: Wikipedia (CC BY-SA)