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visits member for 2 years, 9 months
seen Jul 15 at 22:08

Aug
20
awarded  Teacher
Jul
2
awarded  Curious
May
5
asked How to compute the pdf of a sum of iid random variable using discrete Fourier transform?
Dec
18
awarded  Yearling
Nov
24
accepted Unlike Jensen's Inequality, can we upper bound $\log \sum_{i}{u_i \exp(x_i)}$?
Nov
24
answered Unlike Jensen's Inequality, can we upper bound $\log \sum_{i}{u_i \exp(x_i)}$?
Nov
24
comment Unlike Jensen's Inequality, can we upper bound $\log \sum_{i}{u_i \exp(x_i)}$?
@gammatester. Excuse me. I meant $\max_i |x_i|$. In other words, the infinite norm $||x||_\infty$, where $x = (x_1, x_2, ..., x_n)$.
Nov
22
asked Unlike Jensen's Inequality, can we upper bound $\log \sum_{i}{u_i \exp(x_i)}$?
Nov
12
awarded  Notable Question
Oct
28
awarded  Popular Question
Feb
4
accepted What is the combinatorial meaning of $\sum\limits_{R = 0}^{N}\binom{N}{r}\binom{N-R}{n-r} = \binom{N+1}{n+1}$?
Feb
4
asked 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
31
revised Find the equation of the tangent to the curve with exponential function
I think the answer is y = 2ex-e/2.
Jan
31
reviewed Reviewed Find the equation of the tangent to the curve with exponential function
Jan
31
suggested suggested edit on Find the equation of the tangent to the curve with exponential function
Jan
31
comment Find the equation of the tangent to the curve with exponential function
I think it should be $2ex-\frac{e}{2}$ so that it passes through $(\frac{1}{2},\frac{e}{2})$.
Jan
23
accepted Is the multiplicative Chernoff bound stronger than additive one?
Jan
21
asked Is the multiplicative Chernoff bound stronger than additive one?
Dec
20
awarded  Tumbleweed
Dec
20
comment Does the sum of $\frac{\pm a}{\log(1+ax)}$ have at most finitely many zeros?
@user1551, thanks for the change. Just now I found a solution to this problem.