Patrick Li
Reputation
2,779
Top tag
Next privilege 3,000 Rep.
 Mar 7 comment How to prove that the limit is max(0,x)? @HagenvonEitzen Good point. Thanks. Mar 7 answered How to prove that the limit is max(0,x)? Feb 20 revised $R_{n}\left ( x \right )$ for $f\left ( x \right) = \cos\left ( 2\cdot x \right )$? added 2 characters in body; edited title Feb 20 revised How to prove that $n^2(2^n) / n! \to 0$ as $n \to \infty$ edited title Feb 20 comment Whats the difference between a one way anova and two way anova? If you have two categorical independent variables, you want to use two-way anova to test not only the main effect, but also the interaction between the two variables. Feb 20 revised Change of variables Double integral added 5 characters in body Feb 19 revised Differential equation initial value problem - hard!! added 3 characters in body Feb 16 comment Stuck on this integral involving exp and the floor function If you let $I=\sum_{n=0}^{\infty}n e^{-n}$ and take a look at $I/e$, I think you can find a way to compute it easily. Feb 15 comment Can someone identify this algorithm for great-circle distance? Great circle distance from wiki Feb 14 answered Correlation matrix with all positive correlations positive definite Feb 11 comment Can we simplify this result? What is $\ln^{n-1}x$? $\ln(\ln(\dots(\ln(\ln x)))$ with $n-1$ $\ln$? Feb 10 comment Minimizing a matrix expression $K$ is positive semi-definite and $\lambda n I$ is strictly positive definite if $\lambda > 0$, so $K+\lambda n I$ is strictly positive definite and thus invertible. Feb 6 revised basis and dimension of the splitting field of $x^4+5x^2+6$ edited title Feb 6 comment Percentage point of Normal Distribution. @jill I think that's correct. Feb 6 answered Percentage point of Normal Distribution. Feb 6 revised Percentage point of Normal Distribution. added 6 characters in body Feb 5 revised Multivariable Calculus, Jacobian edited title Feb 4 revised Prove that $1^3 + 2^3 + … + n^3 = (1+ 2 + … + n)^2$ edited title Feb 4 revised how to calculate $q$-expansion coefficients of a modular form? added 5 characters in body; edited title Feb 3 revised Calculus integration problem: $\int(\sec x)(\tan x)(1+\sec x)^{1/2}dx$? edited title