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 Mar 20 answered How did he get this outcome? Feb 28 comment Wave Equation with outgoing wave boundary conditions The boundary conditions you are using, are called "Transparent boundary condition". In fact you'r equation is the tipical IVP wave equation. Thus I dont really know how to deduce those "boundary condition". Dec 18 accepted is this intengral bounded? Nov 14 asked divergence form of the determinant Nov 10 accepted Inner products of weakly convergent sequences Nov 10 comment Inner products of weakly convergent sequences how can I see that if $\|u-u_k\|\to 0$ then $\left \to \left$ ? Nov 10 asked Inner products of weakly convergent sequences Nov 9 accepted Harmonic function product, Knowing that one is Harmonic implies something about the other? Oct 22 answered Use the definition of derivative to prove $\lim_{x\to 0}\ln(x+1)/x =1$ Oct 21 revised Another theorem of Principal value $\overline{\mathbb{H}}^+ = \{ z\in \mathbb{C} : \operatorname{Im} z \geqslant 0\}$ corection Oct 21 suggested approved edit on Another theorem of Principal value Oct 14 comment A meromorphic function is open? can you explain a little bit more the case $1/f(1/z)$ ? Oct 14 awarded Teacher Oct 14 answered The Residues of an even function or an odd function on $U$ subset open symmetric Oct 7 accepted Essential singularity in sine function Oct 7 comment Essential singularity in sine function I have but it's to hard Oct 7 comment Essential singularity in sine function but non-existence is not enougth to say that is an essential singularity. Oct 7 asked Essential singularity in sine function Oct 6 accepted weak solution of poisson equation Sep 30 comment Representation integral for some branch of arcsin(w)? I need to fix the branch were that make sense?