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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 ) $?
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Feb
20
revised How to prove that $n^2(2^n) / n! \to 0$ as $n \to \infty$
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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
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Feb
19
revised Differential equation initial value problem - hard!!
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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.
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Feb
5
revised Multivariable Calculus, Jacobian
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Feb
4
revised Prove that $1^3 + 2^3 + … + n^3 = (1+ 2 + … + n)^2$
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Feb
4
revised how to calculate $q$-expansion coefficients of a modular form?
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Feb
3
revised Calculus integration problem: $\int(\sec x)(\tan x)(1+\sec x)^{1/2}dx$?
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