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 Nov 24 accepted Unlike Jensen's Inequality, can we upper bound $\log \sum_{i}{u_i \exp(x_i)}$? Feb 4 accepted What is the combinatorial meaning of $\sum\limits_{R = 0}^{N}\binom{N}{r}\binom{N-R}{n-r} = \binom{N+1}{n+1}$? Jan 23 accepted Is the multiplicative Chernoff bound stronger than additive one? Nov 11 accepted L1 Minimization with Non-negativity constraints. Oct 5 accepted How to prove the double sample trick inequality $\frac{1}{2} \Pr[|v_1-p| \geq 2 \epsilon] \leq \Pr[|v_1-v_2| \geq \epsilon]$? Sep 15 accepted How to Solve the Matrix Equation $WB = AV$? Jun 26 accepted Is There a $R^2 \rightarrow R^2$ Linear Transformation to Make XOR Problem Separable? Jun 16 accepted The definition of $f(z)$ being analytic at point $\infty$ Jun 16 accepted What is the Laurent Series of $\cos{\frac{1}{\sqrt{z}}}$ at point $z=0$? Jun 15 accepted The Ambiguous Use of Differential in Solving Differential Equations? Jun 15 accepted Does Normal Equation in Linear Regression Have A Unique Solution? Jun 15 accepted Can we find a map for a non-planar graph? how to prove it? Jun 15 accepted Is it A Good Idea To Write Papers With Mathematica? Jun 15 accepted What is the Arg of $\sqrt{(t-1)(t-2)}$ at the point $t=0$? Jun 10 accepted Fitting of Closed Curve in the Polar Coordinate. May 27 accepted Intuitive Understanding About the Implicit Function Theorem May 20 accepted The Laurent Series of $\sqrt{(z-1)(z-2)}$ at the point $z=\infty$? Mar 11 accepted A Problem of Counting Expectation of Inversions in a Half-Sorted List. Feb 26 accepted Is There Any Solution Of the 6174 Problem? Jan 16 accepted The Binary Representation in Number Theory?