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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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Feb
3
revised Total Permutation of graph with $n$ vertex?
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Feb
3
revised hard parametrization problem
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Feb
2
revised Find $\lim_{x\to 0^+} \ln x\cdot \ln(1-x)$
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Feb
2
revised Heat Equation $1D$ with forcing term
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Feb
2
revised Evaluating the definite integral ${\int_{-4}^{4}} (10x^{9} + 7x^{5}) dx$
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Feb
2
revised prove that $\mu$ is a measure $\sigma$-finite.
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Feb
1
revised Prove that $\int_0^{\infty} \frac{\sin(2013 x)}{x(\cos x+\cosh x)}dx=\frac{\pi}{4}$
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Feb
1
awarded  Strunk & White