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 Apr 16 awarded Popular Question Nov 26 awarded Notable Question Apr 6 awarded Popular Question Aug 26 awarded Popular Question Jul 2 awarded Curious May 11 comment Helmholtz equation in Laplace equation of cylinder Great! Thank you! May 11 accepted Helmholtz equation in Laplace equation of cylinder May 11 revised Helmholtz equation in Laplace equation of cylinder edited tags May 11 revised Helmholtz equation in Laplace equation of cylinder added 5 characters in body May 11 comment Helmholtz equation in Laplace equation of cylinder @Jeb: No, I have solved this. It is $\phi$ dependent. May 11 asked Helmholtz equation in Laplace equation of cylinder Feb 2 accepted Prove that $g_1=2\sin(x)+\cos(x)$, $g_2=3\cos(x)$ is a basis in $V$ Feb 2 comment Prove that $g_1=2\sin(x)+\cos(x)$, $g_2=3\cos(x)$ is a basis in $V$ Thank you! I was onto that type of comparison, but I was not sure if that completed the proof. Feb 2 asked Prove that $g_1=2\sin(x)+\cos(x)$, $g_2=3\cos(x)$ is a basis in $V$ Feb 1 accepted Decide a subspace Feb 1 comment Decide a subspace Thank you Paul, that made it! Feb 1 revised Decide a subspace added 8 characters in body Feb 1 comment Decide a subspace Thanks Paul. But how do you think when you set up the span{${x, x^2, x^3}$}? Because to me I cannot find a good way to think when I am supposed to find a base in this case. Feb 1 asked Decide a subspace Jan 28 accepted Check if a matrix is a linear combination