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Author:石川英樹

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直線の軌跡
二次曲線と離心率
正１７角形　作図　regular 17-gon
standingwave
接点の作る円は内接円

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携帯電話料金グラフ
平均値の定理
不等式(加法減法)
Group law on a cubic curve
三角形での面積

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Integers
Variance
Triangles
Fractal Geometry
Rational Numbers

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