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catalogue
Updated 1 month ago by qiang
notebook 平面几何
旋轮线
notebook
Updated 1 month ago by qiang
旋轮线 一个圆在直线上作纯滚动(接触点无滑动),圆上某一点形成的轨迹叫做旋轮线,其参数方程写为 $$ \left\{\begin{array}{cc} x&=&a(\theta-\sin\the...
games
notebook
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2048 fifteen flatris life sudoku sweeper
useful links
notebook
Updated 5 months ago by qiang
tools JXG Preview magma PARI/GP https://www.mathcha.io https://jsxgraph.uni-bayreuth.de/...
test
notebook
Updated 1 year ago by qiang
test math formula: $$\int_0^\infty\frac{1}{1+x^2}dx=\pi/2$$ $\alpha\lt\beta$,$\gamma\pi$ JXG.Op...
Menelaus和Ceva定理
平面几何
Updated 1 year ago by qiang
Menelaus定理 三角形ABC,D, E, F分别在直线BC, AC, AB上,则D, E, F共线的充分必要条件是:有符号线段比值(反方向取负比值)满足 $$\frac{BD}{DC}\f...