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 Feb28 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". Dec18 accepted is this intengral bounded? Nov14 asked divergence form of the determinant Nov10 accepted Inner products of weakly convergent sequences Nov10 comment Inner products of weakly convergent sequences how can I see that if $\|u-u_k\|\to 0$ then $\left \to \left$ ? Nov10 asked Inner products of weakly convergent sequences Nov9 accepted Harmonic function product, Knowing that one is Harmonic implies something about the other? Oct22 answered Use the definition of derivative to prove $\lim_{x\to 0}\ln(x+1)/x =1$ Oct21 revised Another theorem of Principal value $\overline{\mathbb{H}}^+ = \{ z\in \mathbb{C} : \operatorname{Im} z \geqslant 0\}$ corection Oct21 suggested approved edit on Another theorem of Principal value Oct14 comment A meromorphic function is open? can you explain a little bit more the case $1/f(1/z)$ ? Oct14 awarded Teacher Oct14 answered The Residues of an even function or an odd function on $U$ subset open symmetric Oct7 accepted Essential singularity in sine function Oct7 comment Essential singularity in sine function I have but it's to hard Oct7 comment Essential singularity in sine function but non-existence is not enougth to say that is an essential singularity. Oct7 asked Essential singularity in sine function Oct6 asked finding the solution space of helmholtz equation with mixed boundary? Oct6 accepted weak solution of poisson equation Sep30 comment Representation integral for some branch of arcsin(w)? I need to fix the branch were that make sense?