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Soviet-born American-Israeli mathematician who was creator and custodian of https://www.cut-the-knot.org/ which won awards.
Wrote extensively about arithmetic, probability, algebra, geometry, trigonometry and mathematical games.
- Born: January 4, 1948 in Moscow, RSFSR, Soviet Union
- Died: July 7, 2018 in New Brunswick, New Jersey
- 1996 -- 2018: https://www.cut-the-knot.org/