Patrick Li
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 Feb14 answered Correlation matrix with all positive correlations positive definite Feb11 comment Can we simplify this result? What is $\ln^{n-1}x$? $\ln(\ln(\dots(\ln(\ln x)))$ with $n-1$ $\ln$? Feb10 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. Feb6 revised basis and dimension of the splitting field of $x^4+5x^2+6$ edited title Feb6 comment Percentage point of Normal Distribution. @jill I think that's correct. Feb6 answered Percentage point of Normal Distribution. Feb6 revised Percentage point of Normal Distribution. added 6 characters in body Feb5 revised Multivariable Calculus, Jacobian edited title Feb4 revised Prove that $1^3 + 2^3 + … + n^3 = (1+ 2 + … + n)^2$ edited title Feb4 revised how to calculate $q$-expansion coefficients of a modular form? added 5 characters in body; edited title Feb3 revised Calculus integration problem: $\int(\sec x)(\tan x)(1+\sec x)^{1/2}dx$? edited title Feb3 revised Total Permutation of graph with $n$ vertex? added 21 characters in body; edited title Feb3 revised hard parametrization problem added 35 characters in body Feb2 revised Find $\lim_{x\to 0^+} \ln x\cdot \ln(1-x)$ added 6 characters in body; edited title Feb2 revised Heat Equation $1D$ with forcing term added 8 characters in body; edited title Feb2 revised Evaluating the definite integral ${\int_{-4}^{4}} (10x^{9} + 7x^{5}) dx$ added 2 characters in body; edited title Feb2 revised prove that $\mu$ is a measure $\sigma$-finite. added 17 characters in body; edited title Feb1 revised Prove that $\int_0^{\infty} \frac{\sin(2013 x)}{x(\cos x+\cosh x)}dx=\frac{\pi}{4}$ deleted 9 characters in body; edited title Feb1 awarded Strunk & White Feb1 revised determinant $s=n+1$ added 15 characters in body; edited title