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Mathematics
Chao Xu's user avatar
Chao Xu's user avatar
Chao Xu's user avatar
Chao Xu
  • Member for 13 years, 11 months
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About

Assistant Professor at UESTC.

I'm interested in algorithms, combinatorial optimization, computational geometry and problem solving in general.

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Top posts
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112
Why is "the set of all sets" a paradox, in layman's terms?
Jul 20, 2010
97
Why isn't reflexivity redundant in the definition of equivalence relation?
Jul 22, 2010
52
What is the shortest string that contains all permutations of an alphabet?
Dec 25, 2010
28
Balance chemical equations without trial and error?
Jul 24, 2010
28
Find taxicab numbers in $O(n)$ time
Aug 19, 2010
26
What mathematical questions or areas have philosophical implications outside of mathematics?
May 30, 2011
19
Fields that require both CS and pure math
Aug 7, 2010
18
Construct a bijection from $\mathbb{R}$ to $\mathbb{R}\setminus S$, where $S$ is countable
Jul 22, 2010
14
Why is $x^0 = 1$ except when $x = 0$?
Jul 20, 2010
12
$\{1,1\}=\{1\}$, origin of this convention
Jun 8, 2012
Top Meta posts
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General Policy of Environment: More MathOverflow-like, or StackOverflow-like?
4
Calling all Physics, Mathematical Bio, Engineering, Econ, Contest Math, etc. Enthusiasts...
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45
How to use the computer modern font in webpages?
40
Sorting algorithm, such that each element is compared $O(\log n)$ times, and doesn't depend on a sorting network
38
Is it NP-hard to fill up bins with minimum moves?
29
Subset Sum problem with many divisibility conditions
24
Collectively pay the bill problem