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Mathematics
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W. Zhu's user avatar
W. Zhu's user avatar
W. Zhu
  • Member for 7 years, 10 months
  • Last seen more than a month ago
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Math is my passion.

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Top posts
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10
What is the difference between a unit simplex and a probability simplex?
Jan 17, 2019
7
Numerical integration of $\int_0^{2\pi}\frac{dx}{3+\sin x}$
Dec 12, 2016
6
The limit of $(1+\frac1x)^x$ as $x\to\infty$
Nov 28, 2016
6
Hyperbolic substitution for $\int\frac{dx}{x\sqrt{1-x^2}}$
Jan 8, 2017
6
Proving $a\cos x+b\sin x=\sqrt{a^2+b^2}\cos(x-\alpha)$
Jan 6, 2017
6
Deriving $\sin{ix}=i\sinh{x}$
Dec 31, 2016
4
What is the probability of sharing a birthday if a year has an infinite number of days?
Dec 4, 2022
4
Proving $x^e = e^x$ has only one positive solution
Dec 19, 2016
3
$Ax^2+Bxy+Cy^2=1$ with $A=C=1$ and $B=2$ should be a parabola (because $B^2 = 4 AC$). Instead, it represents parallel lines. What went wrong?
Jan 19, 2019
3
Schwarz inequality in linear algebra and probability theory
Jan 13, 2019
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19
Why does foldl' use a lot of RAM with complex data structures?
8
Arrays of pointers that point to arrays of integers
7
sapply equivalent in python?