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[几何] Sierpiński 曲线的面积

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hbghlyj Posted at 2024-10-29 17:31:59 |Read mode
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Mathematica计算出$S_n$的面积为\[\frac{2048}{3} \left(5\times 2^{2 n+1}-7\right)\]如何证明?
  1. FindSequenceFunction[Table[RegionMeasure[Polygon @@ SierpinskiCurve[n]], {n, 6}], n]
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 Author| hbghlyj Posted at 2024-10-30 01:15:25
L-system
Alphabet: F, G, X
Constants: F, G, +, −
Axiom: F−−XF−−F−−XF
Production rules:
X → XF+G+XF−−F−−XF+G+X
Angle: 45
可以看到其中“X”出现了四次,然后呢?

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爪机专用 Posted at 2024-10-30 13:46:35
从图像上来看就是,下一个图,是上一个图重复四次,再加上中心一个连接起来的块(一个八边形)。
所以是f(n+1)=4f(n)+C,其中C是中心连接块的面积,具体每条边的边长我不清楚,所以不知道C是多少
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 Author| hbghlyj Posted at 2024-10-30 15:54:38
爪机专用 发表于 2024-10-30 05:46
从图像上来看就是,下一个图,是上一个图重复四次,再加上中心一个连接起来的块(一个八边形)。
所以是f(n ...

archive.lib.msu.edu/crcmath/math/math/s/s277.htm 寫道:
1000000668.gif
The limit of the curve illustrated above has Area
$$
A={5\over 12}.
$$
n→∞ 时,其面積與正方形面積之比的極限是 5/12,如何证明?

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 Author| hbghlyj Posted at 2024-10-30 16:16:36
如果 $S_n$ 公式没错的话,正方形的边长应该是 $128\times2^n$
$${\frac{2048}{3} \left(5\times 2^{2 n+1}-7\right)\over(128\times2^n)^2}\to\frac5{12}$$

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