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 Jul 2 awarded Curious Sep 7 comment Changing the space of test functions in PDEs So the second definition ($C^1_c$) is only bad when we want to discuss second order derivatives. Sep 6 asked Changing the space of test functions in PDEs Jul 17 revised Two equivalent definitions of weak solution to parabolic PDE; don't understand proof edited title Jul 17 asked Two equivalent definitions of weak solution to parabolic PDE; don't understand proof May 24 asked Does this ODE system have solution? May 10 comment $\mathcal{D}(0,T;V)$ is dense in $W(0,T)$ @AndrasBatkai thank you a lot. Unfortunately I don't have access to that. Do you have a PDF of that (if legal, otherwise obviously ignore this)? May 10 comment $\mathcal{D}(0,T;V)$ is dense in $W(0,T)$ $[0,T]$ is an interval. This is a research-level question. May 10 revised $\mathcal{D}(0,T;V)$ is dense in $W(0,T)$ added 68 characters in body May 10 asked $\mathcal{D}(0,T;V)$ is dense in $W(0,T)$ Apr 16 comment Using Galerkin method for PDE with Neumann boundary condition? Yes,thank you, good answer. Apr 12 awarded Supporter Apr 11 comment Using Galerkin method for PDE with Neumann boundary condition? But how do we know that the solution satisfies the BC without assuming the solution is smooth enough? Apr 11 revised Using Galerkin method for PDE with Neumann boundary condition? added 151 characters in body Apr 11 awarded Scholar Apr 11 accepted Fourier transform of function on compact set and Sobolev norm equivalence Apr 11 asked Using Galerkin method for PDE with Neumann boundary condition? Mar 27 comment Galerkin method for existence for PDE with nonsymmetric bilinear form @timur thanks, it's here: math.stackexchange.com/questions/344230/… Mar 27 awarded Editor Mar 27 revised Galerkin method for existence for PDE with nonsymmetric bilinear form added 39 characters in body; edited body