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 Apr 12 comment Different use of approximate equality symbols Thank you very much! What about Taylor series and approximate values of variables. Let's say,respectively: $f(x)\simeq f(x_0)+f'(x_0)(x-x_0)$; and $r=aB/2\simeq 2$? Apr 12 comment Different use of approximate equality symbols What would be a possible choice of the different meaning that makes use of all three? Thanks! Jan 26 comment Linear differential system of Bessel equations Thanks for your answer. Could you please quote the code you used on Mathematica as well? That would help a lot! Jan 11 comment Particular solution to nonhomogeneneous 2nd order ODE If that counts, anyway, I was looking for the general solution, without specified bcs. I know that one must be aware of its significance and that this cannot be done for pdes, etc. But in my specific case I want to keep the freedom to study different bcs. Jan 11 comment Particular solution to nonhomogeneneous 2nd order ODE The minus sign is in front of the wrong term, I guess. Jan 11 comment What is this ODE called and how to solve it Laplacian of $g(r)$, but about the last term? Jan 11 comment What is this ODE called and how to solve it @achillehui Yes, thanks! Edited. Jan 11 comment Particular solution to nonhomogeneneous 2nd order ODE @Pragabhava Could you expand on that please? Nov 10 comment Does this common PDE have a name? I edited the equation to make my issue clearer. Nov 10 comment Does this common PDE have a name? My concern is the following: the Helmoltz equation does admit a solution with products of trigonometric functions and corresponding bessel J functions. The one I wrote, with a minus instead of a plus, does not admit such solutions. Infact admits exponential solutions, because of its structure. Therefore, I cannot see how they are the same thing. Nov 9 comment Does this common PDE have a name? I can't find it in this form though, could you help me with that please? Thanks! Nov 9 comment Does this common PDE have a name? Doesnt' Helmoltz equation have a plus in front of $u$? Nov 9 comment Logarithmic expansion with cosines Thanks! But what happens to the first term of the r.h.s.? Sep 14 comment Line integral of conservative field in polar coordinates This does not answer the question, since this seems in agreement with the first derivation, isn't it? Sep 14 comment Line integral of conservative field in polar coordinates Although...math.stackexchange.com/questions/696637/… Jul 8 comment 2D Poisson equation and Bessel Functions Thanks a lot, do you think it does make sense though to use Hankel Transform, or should I expand in Fourier as usual and express $J_2$ that way? Would this work as well? Jun 15 comment Simple Laplace equation with peculiar boundary condition Won't the fact that I am neglecting the terms with $k<0$ in the Fourier series of $\cos(\theta/2)$ give the wrong result? Jun 14 comment Fourier coefficients of $\cos(x/2)$ In the interval $[0,2\pi]$ Jun 13 comment Simple Laplace equation with peculiar boundary condition Well, I guess it is similar to what I meant to do with my sum, but the k/2. But, will the $R^{-k}$ give any problems in finding the coefficients $A_k$? Dec 13 comment Finite differences and conservation law I edited the question to avoid getting too much into the detail of my specific problem, I hope that increases the interest.