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 updated 27th Mar 2017

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.259 [災害] 「トンネル内空測定にむけて: レーザー距離計の操作手順」をまとめました<ここ>(3月26日)。

No.258 [災害] 「笹子トンネル崩落の新事実 (6)―国交省・NEXCO中日本への問い合わせと回答」をまとめました<ここ>(2月8日)。

No.257 [組体操] 「巨大組体操の危険性を検証する」の英語版"A scientific investigation of risk in large gymnastic formations"が『大阪経大論集』第67巻第5号, 7-16頁に掲載されました(1月16日)。

← World University Ranking Top 127/200 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)

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