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 24th June 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.262 [エレガント] 『数学セミナー』 2017年7月号の「エレガントな解答をもとむ」欄に、組体操の負荷量に関する整数問題を出題しました(6月12日)。

No.261 [災害] 『週刊金曜日』1138号に明石昇二郎「笹子トンネル天井板落下事故で新事実―大成建設施工の天頂部だけが波打っていた」が掲載されました<ここ>。真相を探る会が4月17日に実施した現地調査の結果が引用されています(6月2日)。

No.260 [災害] 「天井板崩落は予知できた―笹子トンネル現地計測を終えて」をまとめました<ここ>(5月15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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