In this paper, we show that for several second-order partial differential equations \begin{align*}L[u] &= A(x,y)u_{xx} + 2B(x,y)u_{xy} + C(x,y)u_{yy} + D(x,y)u_x + E ...
This is a preview. Log in through your library . Abstract The maximum principle of Fichera for a single second order partial differential equation with nonnegative characteristic form is extended to ...
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