sum of interior angles of a polygon 19.8.2024
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a quadratic equation problem 25.6.2024
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A easy problem of quadratic equation 29.6.2024
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新年快乐2024
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韩信点兵 21.4.2024
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Fermat's Last Theorem for n = 4 _part 2_proof of both using and not using P.P.T.
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antiderivative of 1 over x 24.8.2024
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同余和阶 20.9.2023
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pigeonhole principle 抽屉原理 ① 5.8.2023
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自学日常（欧拉方程｜Grant Sanderson) 15.1.2023
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鸡兔同笼2 26.12.2022z
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proof of product rule and quotient rule 30.12.2023
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Linear Diophantine equation in two variables [part 3] 17.5.2024
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pigeonhole principle 抽屉原理 ② 5.8.2023
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primitive pythagorean triples 30.8.2024
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sin(2x)=2sinxcosx 23.4.2023
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a magic square problem 16.8.2024
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约数个数定理 16.2.2024
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inverse function 13.3.2023
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derivative of -cos (2theta), (intuitive chain rule) 5.5.2023
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f(xy)=f(x)+f(y) and f(xy)=f(x)f(y) 29.5.2024
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proof of derivative of tan(x), arctan(x), cot(x), arccot(x) 30.12.2023
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modulo 143 20.2.2024
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inscribed angle theroem 圆周角定理 17.8.2023
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complex number _(2)_imaginary number 1.4.2023
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The herdsman and the lost bull (Aesop’s Fables) 背书可太累了😄 28.10.2023