Vladimir Grigorevich Boltyansky (Russian: Влади́мир Григо́рьевич Болтя́нский; 26 April 1925 – 16 April 2019),[1] 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 Hilbert's third problem.