Homepage of Yutaka Nishiyama(西山豊)


巨大組体操の
危険性を検証する


笹子トンネルは
設計ミス、施工ミス

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


Boomerang Instructions in 70 Languages
 Last update 21 Apr 2018

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.277 [組体操] 「危険な移動ピラミッドによる膝立ち―広島大附属三原中学での組体操死亡事故に関連して」をまとめました。春の運動会の練習が始まっていると思いますが、関係者は特に注意してください。<ここ>(4月21日)。

No.276 [災害] 「談話室:笹子トンネル崩落の真相」が『日本の科学者』2018年5月号、32-33ページに掲載されました。<ここ>(4月14日)。

No.275 [書評] BOOKS石井俊全著『ガロア理論の頂を踏む』が『数学文化』No.29, 85-87, 2018.2に掲載されました(2月22日)。

← World University Ranking Top 139/200 registered "Mysterious Number 6174."

              54 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 (J) (1) (2) (Wi)

Boomerang

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Return to Sender
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