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Yutaka Nishiyama

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Subject: 2000 yen note, Coupling, Finger-counting, Boomerang, Horizontal and vertical writing in East Asian scripts
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Yutaka Nishiyama

Yutaka Nishiyama (西山 豊 Nishiyama Yutaka, born 21 October 1948) is a Japanese mathematician and professor at the Osaka University of Economics, where he teaches mathematics and information. He is known as the "boomerang professor".[1] He has written nine books about the mathematics in daily life.[2] The most recent one, The mystery of five in nature, investigates, amongst other things, why many flowers have five petals.



  • 50 Visions of Mathematics, Oxford University Press, May 2014, ISBN 978-0-19-870181-1
  • The Mysterious Number 6174: One of 30 Mathematical Topics in Daily Life, Gendai Sugakusha, July 2013, ISBN 978-4-7687-6174-8


  • General Solution for Multiple Foldings of Hexaflexagons IJPAM, Vol. 58, No. 1, (2010). 113-124. "19 faces of Flexagons"
  • Fixed Points in Similarity Transformations IJPAM, Vol. 56, No. 3, (2009). 429-438.

Articles for Plus Magazine

  • A bright idea, Plus Magazine, issue 36, University of Cambridge, September 2005.
  • Mysterious Number 6174, Plus Magazine, issue 38, University of Cambridge, March 2006.
  • Winning Odds, with Steve Humble, Plus Magazine, issue 55, University of Cambridge, June 2010.
  • Having fun with unit fractions, Plus Magazine, University of Cambridge, Feb 2012.
  • Circles rolling on circles, Plus Magazine, University of Cambridge, May 2014.


  1. ^ Boomerang International Project 2007, Instructions of Paper Boomerangs in 70 Languages.
  2. ^ Mathematics in Daily Life
  3. ^ Millennium Mathematics Project

External links

  • Homepage of Yutaka Nishiyama
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