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 Jul2 awarded Curious Jun6 accepted Solve a special differential equation Jun5 asked Solve a special differential equation Jun11 awarded Supporter Jun11 comment Vector analysis: $(\vec v \cdot \vec \nabla) \vec v=(\vec \nabla \cdot \vec v) \vec v$? Oh yes, I was a bit confused sorry. Now I understand, thank you for your answer. Jun11 accepted Vector analysis: $(\vec v \cdot \vec \nabla) \vec v=(\vec \nabla \cdot \vec v) \vec v$? Jun11 comment Vector analysis: $(\vec v \cdot \vec \nabla) \vec v=(\vec \nabla \cdot \vec v) \vec v$? But $v \cdot \nabla = \nabla \cdot v$ in general, right ? This is what troubles me. Jun11 asked Vector analysis: $(\vec v \cdot \vec \nabla) \vec v=(\vec \nabla \cdot \vec v) \vec v$? Aug24 accepted Evaluation of $\int_0^{2\pi} \frac{1}{1+3\cos^2(\theta)} \, d\theta$ Aug23 comment Evaluation of $\int_0^{2\pi} \frac{1}{1+3\cos^2(\theta)} \, d\theta$ should I erase the question ? Aug23 comment Evaluation of $\int_0^{2\pi} \frac{1}{1+3\cos^2(\theta)} \, d\theta$ @did: you're right, thanks and.. damn! Aug23 asked Evaluation of $\int_0^{2\pi} \frac{1}{1+3\cos^2(\theta)} \, d\theta$ Aug19 asked Solving an ODE with parametrized variables Aug13 awarded Scholar Aug13 accepted Determine characteristics for the method of characteristics Aug12 comment Determine characteristics for the method of characteristics Thanks for the explanation about the method but I still don't understand how to solve the separable ODE with the parameter $s$ (or $t$ as you used) as my professor did (though I have no problem to solve the equation without it). Why does he put $[s,x]$ and $[x,y]$ as domains of integration ? I guess I am mindblocking but could you just show me the steps ? Aug12 awarded Student Aug12 asked Determine characteristics for the method of characteristics