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Yutaka Nishiyama | |
---|---|

西山豊 | |

Born | 21 October 1948 |

Occupation | University academic, author |

Known for | Mathematical study of Boomerangs |

Academic background | |

Education | Kyoto University |

Academic work | |

Discipline | Applied mathematics |

Institutions | Osaka University of Economics |

Notes | |

Infobox contains data translated from Japanese Wikipedia |

**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.

- 1967-1971: Faculty of Mathematics, Department of Science, Kyoto University
- 1971-1985: IBM Japan as a Systems Engineer
- 1985: Lecturer of Information Mathematics at Osaka University of Economics
- 1995–present: Professor at Osaka University of Economics
- 2005-2006: Visiting fellow at University 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.

**John Horton Conway** is an English mathematician active in the theory of finite groups, knot theory, number theory, combinatorial game theory and coding theory. He has also made contributions to many branches of recreational mathematics, most notably the invention of the cellular automaton called the Game of Life. Conway spent the first half of his long career at the University of Cambridge, in England, and the second half at Princeton University in New Jersey, where he now holds the title John von Neumann Professor Emeritus.

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**Sir Partha Sarathi Dasgupta**, FRS, FBA, is an Indian-British economist who is the Frank Ramsey Professor Emeritus of Economics at the University of Cambridge, United Kingdom; Fellow of St John's College, Cambridge, and Visiting Professor at the New College of the Humanities, London. He was born in Dhaka, present-day Bangladesh, then moved to present-day India, and is the son of the noted economist Amiya Kumar Dasgupta. He is married to Carol Dasgupta, who is a psychotherapist. His father-in-law was the Nobel Laureate James Meade.

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**Hua Luogeng** or **Hua Loo-Keng** was a Chinese mathematician and politician famous for his important contributions to number theory and for his role as the leader of mathematics research and education in the People's Republic of China. He was largely responsible for identifying and nurturing the renowned mathematician Chen Jingrun who proved Chen's theorem, the best known result on the Goldbach conjecture. In addition, Hua's later work on mathematical optimization and operations research made an enormous impact on China's economy. He was elected a foreign associate of the US National Academy of Sciences in 1982. He was elected a member of the standing Committee of the first to sixth National people's Congress, Vice-Chairman of the sixth National Committee of the Chinese People's Political Consultative Conference and Vice-Chairman of the China Democratic League (1979). He joined the Communist Party of China in 1979.

**Yutaka Ozaki** was a popular Japanese musician. He is ranked at No. 23 in a list of Japan's top 100 musicians by HMV.

**Penney's game**, named after its inventor Walter Penney, is a binary (head/tail) sequence generating game between two players. Player A selects a sequence of heads and tails, and shows this sequence to player B. Player B then selects another sequence of heads and tails of the same length. Subsequently, a fair coin is tossed until either player A's or player B's sequence appears as a consecutive subsequence of the coin toss outcomes. The player whose sequence appears first wins.

**Yutaka Yaguchi** is the Chief Instructor and Chairman of the International Shotokan Karate Federation (ISKF) Mountain States Region. He was born in Hiroshima, Japan, in 1932 and began karate training in 1952. He later tested under masters Gichin Funakoshi for his 1st *dan* black belt and Masatoshi Nakayama for his 2nd through 8th *dan* black belts. As one of the first graduates of the Japan Karate Association (JKA) Instructors' Training Program in 1959, he has played an important role in the growth of JKA karate and the internationalization of Shotokan karate. Yaguchi first arrived in the United States on June 5, 1965, and continues to reside in the US to the present day. In 1974, Yaguchi founded the ISKF of Colorado, the regional headquarters for the Mountain States Region.

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**Yutaka Tsujinaka** is a professor of political science and the Graduate School of Humanities and Social Sciences at the University of Tsukuba. He is now teaching at the College of Social Sciences and the doctoral program in International and Advanced Japanese Studies. He is also the president of Japan Political Science Association, a member of the International Association of Universities (2012–2016), the director of Internationalization Subcommittee of IAU (2013–), the executive assistant to the President at University of Tsukuba (2013–) and the director of Institute for Comparative Research in Human and Social Sciences (ICR) (2014–). Youji Inaba professor of economy at Nippon University said in a newspaper column that Professor Tsujinaka talks in friendly Kansai dialect and always gives everyone warm smile as if he has "Tender-Heated DNA" in his body. (Nikkei: July 8, 2015)

**6174** is known as **Kaprekar's constant** after the Indian mathematician D. R. Kaprekar. This number is notable for the following rule:

- Take any four-digit number, using at least two different digits.
- Arrange the digits in descending and then in ascending order to get two four-digit numbers, adding leading zeros if necessary.
- Subtract the smaller number from the bigger number.
- Go back to step 2 and repeat.

- ↑ Boomerang International Project 2007, Instructions of Paper Boomerangs in 70 Languages.
- ↑ Mathematics in Daily Life
- ↑ Millennium Mathematics Project

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