Homepage of Yutaka Nishiyama(西山豊)


都道府県別
組体操事故データ


組体操の負荷量
計算シート

      Boomerang by Prof Yutaka Nishiyama at river side of Yodo in 1992


Boomerang Instructions in 70 Languages
 Last updated 20th Aug 2016

Plus online magazine of Cambrigde University, UK

Mysterious Number 6174, Mar 2006
Most popular article!
Winning Odds, June 2010 (C) Unit Fractions, Feb 2012 (C)
50 Visions of Mathematics
May 2014
Circles rolling on circles
May 2014

            Topics   ( Old Topics since Jan 2011 )
No.244 [組体操] 『日本の科学者』2016年9月号に「巨大組体操の危険性を検証する―必要とされる科学の眼」Vol.51, No.9, 32-37, (2016). が掲載されました(8月20日)。

No.243 [引用] 樋口晴彦、中日本高速道路笹子トンネル事故の事例研究、千葉商大論集、52(1), 273-293, 2014-09 に、拙稿 西山豊、笹子トンネル事故を考える―科学者の社会的責任から、日本の科学者、48(7), 34-40, 2013 が引用されています(8月5日)。

No.239 [書評] イギリスの数学協会にあたる IMA の雑誌 Mathematics Today に拙著 Mysterious Number 6174 の書評が掲載されました<ここ>(4月6日)。

← World University Ranking Top 127/200 registered "Mysterious Number 6174."

              53 Mathematics in Daily Life  (J):Japanese, (S):Spanish, (C):Chinese, (Wi):Wikipedia

1. Boomerang (J)(Wi)(R)
2. Five Petals (J)
3. Fixed Point (J)(Wi)
4. Boolean Algebra (J)
5. Stroboscope (J)
6. Egg Shape (J) (S)
7. Barcodes (J)
8. Harmonic Series (J)
9. Moebius (J)
10. Hexaflexagon (J)(Wi)
11. Inside out (J)
12. Miura Folding (J)
13. Sepak Takraw (J)(P)
14. Increasing of Area (J)
15. 6174 (J)(Wi)
16. Palindrome 196 (J) (Wi)
17. Oldham Coupling (J)
18. Planimeter (J)
19. Sicherman Dice (J)
20. Montmort Theory (J)
21. Random Number (J)
22. Root 2 (J)
23. Cycloid (J)
24. Machin and Pi (J)
25. Burnside Lem. (J)(Q)
26. Heptadecagon (J)
27. Sudoku (J)
28. Odd and Even (J)
29. Curve & Straight (J)
30. Finger Count (J) (S)
31. Writing Direction (J)
32. Penney Ante (J)(C)(Wi)
33. Flex Geometry (J)
34. Van Aubel (J)(Wi)
35. Red or Black (J)
36. Similarity Trans (J)
37. 52 Cycling Cards (J)
38. Straw Flute (J)
39. Minor Keys (J)
40. Benham's Top (J)
41. 2000 Yen (J)(Wi)
42. Unit Fraction (J)(C)
43. Card Shuffle (J)
44. Kruskal Count (J)(F)
45. Triangle 3 Colors (J) (Q)
46. Fullerene C60 (J)
47. Random dots, Regular
48. 19 faces of HexFlex
49. Wheel Question (Q)(J)
50. 1/998001(J)
51. Zeta function (J)
52. Sepak based C60 (J)
53. 100-cells calc (J)(F
54. Pyaramid (1) (2) (Wi)

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