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 Jun 26 awarded Yearling Jul 12 comment Show a PDE satisfies a ODE The second term of the answer is $\theta^\prime \omega + \theta + \omega^\prime$. However, $\theta^\prime$ seems undefined because $\theta$ is a function of two variables, $x$ and $t$. So I do not know what the ODE really represents. Unless $x(t)$? Jul 12 answered Confused between multiple representations of Fourier Series' formula Jul 11 revised Laurent series expansion of a function deleted 1 characters in body Jul 11 answered Laurent series expansion of a function Jul 11 answered Laurent series expansion of a function Jul 11 answered How to calculate what matrix will transform specified points to other specified points Jul 11 comment Green's Theorem Bounded by Triangle There are several Green's theorems. Some specification which one is expected to be used would help. Jul 11 comment Optimizing a meal based on the nutrients in the foods in it Maybe try Simulated Annealing as an alternative optimization method, if GA does not work for you. Jul 9 comment Chain rule question because $2vy$ should have been $2uy$. Jul 9 answered Find maximum likelihood estimator, trick? Jul 8 comment Uniform grid on a disc I don't understand you question: uniformity is a property of the grid itself, not of the surface to which it is applied. Or do you mean a conformal transformation like between the complex z- and w- planes? Jul 8 answered n-correlation function. Jul 8 answered Is it possible to have multiple decimal points in a number? Jul 8 answered Prove that, if $0 < x < 1$, then $(1+\frac{x}{n})^n < \frac1{1-x}$ Jul 8 comment Does $\int e^\frac 1x \, \mathrm dx$ has a closed form? Yes, solution is in terms of exponential integral function Ei(), which is tabulated. Integral of that function, you will need to term by term, after expanding Ei() in a series. Jul 8 awarded Commentator Jul 8 comment Angle in a triangle with bisectors So what is your question? Jul 8 answered Does $\int e^\frac 1x \, \mathrm dx$ has a closed form? Jul 8 answered Square roots in arbitrary fields