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# 61 Actions

 Dec12 asked Finite differences and conservation law Jul8 comment Space-dependent diffusivity and finite-differences Found the mistake, in the explicit part I used $u_{j+1}-u_j$ instead of $[u_{j+1}-u_{j-1}]/2$! Jul8 comment Space-dependent diffusivity and finite-differences Usually, to test it in the simplest case, I use $D(x)=x$ or $D(x)=1-x$, to see how it behaves going to both boundaries. Jul8 asked Space-dependent diffusivity and finite-differences Jun5 accepted Multiplying a vector and a matrix's rows Jun5 comment Multiplying a vector and a matrix's rows Could you please explicit that? Jun5 asked Multiplying a vector and a matrix's rows Apr29 accepted Third-order Linear Parabolic PDE Apr29 asked Third-order Linear Parabolic PDE Nov7 awarded Supporter Oct25 comment Vectorial derivative @Nick Could you help me trying to explicit the calculation in components of with the index notation? Because I cannot see it, sorry. Oct25 comment Vectorial derivative Why should I do that, mate? Oct25 asked Vectorial derivative Feb21 comment Orthogonal Part Operator $(\boldsymbol{p}\cdot\nabla\boldsymbol{p})_\alpha=p_\beta\partial_\beta p_\alpha$ Feb21 comment Orthogonal Part Operator No, I simply meant the application of $P$ to those terms: $P(\boldsymbol{p}\cdot\nabla\boldsymbol{p})$ Feb21 revised Orthogonal Part Operator added 3 characters in body Feb21 revised Orthogonal Part Operator added 57 characters in body Feb21 comment Orthogonal Part Operator Yes, I need to be clearer. $\boldsymbol{p}$ is a column vector of $\mathbb R^3$, function of $\boldsymbol{x}$, respect to which the differentiation in $\nabla$ is carried. The $P$ operator is exactly the matrix $P_{\alpha\beta}=\delta_{\alpha\beta}-p_\alpha p_\beta$ Feb21 asked Orthogonal Part Operator Jul3 awarded Autobiographer