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Kirby Lee's user avatar
Kirby Lee's user avatar
Kirby Lee's user avatar
Kirby Lee
  • Member for 9 years, 2 months
  • Last seen more than 3 years ago
  • Tianjin, China
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An idiot in math & physics.Reading and music are what I enjoy. Mostly be found in library or somewhere peaceful.

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A point set of power series with coefficients in {-1, 1}. Connected or not?
Nov 20, 2015
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How to evaluate $\int_0^{\infty} \frac{\sin^2 x}{x^2-\pi ^2} dx$
5
$n \times n$ positive matrix with $a_{ij} a_{ji} = 1$ has an eigenvalue not less than $n$