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 Mar 31 accepted Finding the basic reproduction number of a particular model Mar 30 answered Finding a basis for a space of solutions. Mar 30 comment Finding a basis for a space of solutions. You can find a basis for $M$, from the equation. After that, you can use the fact that equivalent matrices generate the same row space. Mar 30 awarded Yearling Mar 30 accepted A singular $n-$cube and a circumference defined the border than 2-cube Mar 30 asked Motivation for Non-Euclidean geometry: relativity Oct 1 awarded Notable Question Apr 4 awarded Popular Question Feb 11 asked About consistency in an inverse problem formulation Jan 4 accepted Proving that the solutions of a system of ODE $\frac{dx}{dt}=-\nabla V(x)$ are defined for all positive time. Jan 2 revised Proving that the solutions of a system of ODE $\frac{dx}{dt}=-\nabla V(x)$ are defined for all positive time. edited body Jan 2 asked Proving that the solutions of a system of ODE $\frac{dx}{dt}=-\nabla V(x)$ are defined for all positive time. Oct 26 revised Scheme for mixed partial derivative from Taylor added 19 characters in body Oct 26 asked Scheme for mixed partial derivative from Taylor Oct 13 revised PDE using $\theta$ method in Matlab added 11 characters in body Oct 13 revised PDE using $\theta$ method in Matlab added 13 characters in body Oct 13 asked PDE using $\theta$ method in Matlab Oct 5 awarded Self-Learner Sep 30 awarded Explainer Sep 17 comment Integral of harmonic function in a ball Also, I know the Green's identity: $\int_{\Omega} \Delta u dx = \int_{\partial \Omega} \frac{\partial u}{\partial n} ds$, but I was a little confused with the expression "by calculating the line integral". Thank you.