m0nhawk
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 17h comment Solve doesn't solve my transcendental equation Can you add them too? Maybe it will be useful. 17h comment Solve doesn't solve my transcendental equation I fear not, only some approximate solution, or a numeric one. 17h comment Solve doesn't solve my transcendental equation Mathematica is unable to solve transcendental equation. Specially, when you have d in various combinations of transcendental functions. 1d comment No analogue for Maple's dchange? For a quiet long time of using Mathematica the Replace and ReplaceAll are more than enough and, actually, I found them much powerful than Maple's dchange. 1d comment No analogue for Maple's dchange? possible duplicate of Change variables in differential expressions 1d comment Failing to solve a simple PDE with NDSolve @yep And does the solution looks like the intended? 1d comment Failing to solve a simple PDE with NDSolve @yep This works for me: gist. 1d comment Failing to solve a simple PDE with NDSolve I have replaced the conditions with DirichletCondition and it solves the equation. 2d comment Boundary condition not correctly imposed for NDSolve Oh, haha. Anyway, this links are kind of useful addition to an answer. 2d comment Boundary condition not correctly imposed for NDSolve By default, no. NDSolve quiet dumb here, it's only solves the equation with given accuracy and precision. For additional analysis there is at least "StiffnessSwitching" Method for NDSolve. And Stiffness Detection. 2d comment Boundary condition not correctly imposed for NDSolve First, you have very unstable equation, try various initial values, like 10^-6, 10^-3 and other in the 1/10^6 point. Also, this equation perfectly analytically solvable. 2d comment EllipticK error message 2d comment Double integral not evaluating in mathematica,though the functions in the integral give definite value I'm not sure if you are kidding, or just don't need help. Provide full code in the question, without any undefined functions. Otherwise no one will be able to help. 2d comment Using Runge-Kutta method to find arc length @user27670 Plot3D needs two parameters for plotting, not only t. Does the Plot[tfn[t], {t, 0, 2*Pi}] is what you need? Apr16 comment Double integral not evaluating in mathematica,though the functions in the integral give definite value Add the definition of p to the question please. Also the definitions of p1 and d. Apr16 comment Double integral not evaluating in mathematica,though the functions in the integral give definite value You have undefined p in your function. So NIntegrate can't calculate it. Apr15 comment How do I input an integral that needs to use Cauchy's formula? So... What is the question? Apr14 comment Unable to Solve (for arclength parametrization) Are you plan to solve for an undefined r? Apr12 comment Deriving a Rayleigh distribution Yeah, I know, I just provide a usefull information that other Mathematica version have other output. Apr12 comment Deriving a Rayleigh distribution I'm getting WeibullDistribution[2, Sqrt[2]/Sqrt[1/\[Sigma]^2]] for d2. Mathematica 10.1.