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This is the blog of Chao Xu.

 Represent an element in a free monoid with minimum weight 2013-03-26 Regular expression for a interval of non-negative integers 2013-03-21 A Data Structure Reduction 2013-02-04 There exist a path of length $$\lceil d(G)\rceil$$ for every graph $$G$$ 2013-01-30 Number of ways to make change 2012-08-31 Basis of the module $$\Z^n$$ 2012-08-30 A relation between $$L_\infty$$ metric and $$L_1$$ metric in $$\R^2$$ 2012-08-23 Maximize the area of a radar chart 2012-08-08 A cute theorem involving xor 2012-06-19 Proof that binomial coefficients are integers 2012-04-23 See More...