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Yutaka Nishiyama (西山 豊,Nishiyama Yutaka, born 21 October 1948) is a Japanesemathematician 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.

• 1967-1971: Faculty of Mathematics, Department of Science,Kyoto University
• 1971-1985:IBM Japan as a Systems Engineer
• 1985: Lecturer of Information Mathematics atOsaka University of Economics
• 1995–present: Professor atOsaka University of Economics
• 2005-2006: Visiting fellow atUniversity of Cambridge, UK, joined for MMP.^[3]

• 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.

• 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.

• Homepage of Yutaka Nishiyama

• 1948 births
• 20th-century Japanese mathematicians
• 21st-century Japanese mathematicians
• Kyoto University alumni
• Living people
• Academic staff of Osaka University
• Scientists from Shiga Prefecture

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• Short description matches Wikidata
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