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Jichao
  • Member for 13 years, 11 months
  • Last seen more than a month ago
  • China
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Full stack hello world developer

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219
Evaluation of Gaussian integral $\int_{0}^{\infty} \mathrm{e}^{-x^2} dx$
Nov 7, 2010
184
How to prove Euler's formula: $e^{i\varphi}=\cos(\varphi) +i\sin(\varphi)$?
Aug 28, 2010
49
Could you explain why $\frac{d}{dx} e^x = e^x$ "intuitively"?
Aug 22, 2010
45
Is there any connection between Green's Theorem and the Cauchy-Riemann equations?
Nov 29, 2010
34
How to prove that the derivative of Heaviside's unit step function is the Dirac delta?
Dec 11, 2010
31
An intuitive explanation of the Taylor expansion
Nov 8, 2010
24
Find a function $f: \mathbb{R} \to \mathbb{R}$ that is continuous at precisely one point?
Aug 27, 2011
19
Prove $\epsilon$-$\delta$ definition of continuity implies the open set definition for real function
Sep 19, 2011
18
What does smooth curve mean?
Nov 27, 2010
12
Why do we need vectors and who invented it?
Nov 20, 2010
Top network posts
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1978
How can I set the default value for an HTML <select> element?
402
What are the applications of binary trees?
286
What's the difference between IP address 0.0.0.0 and 127.0.0.1?
211
sudo with password in one command line?
179
What's the meaning of a dot before a command in shell?