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.

Yutaka Nishiyama
Born (1948-10-21) 21 October 1948 (age 73)
OccupationUniversity academic, author
Known forMathematical study of Boomerangs
Academic background
EducationKyoto University
Academic work
DisciplineApplied mathematics
InstitutionsOsaka University of Economics
Infobox contains data translated from Japanese Wikipedia



  • 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
HP of Yutaka Nishiyama


  • 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 MagazineEdit

  • 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 linksEdit

  • Homepage of Yutaka Nishiyama