Neumann boundary conditions
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Neumann conditions, Neumann data, boundary conditions of the second kind
Consider a second-order partial differential equation $Lu=f$ on a domain $D$ in $\mathbf R^n$ with boundary $S$ (cf. also Differential equation, partial, of the second order). Boundary conditions of the type
$$\frac{\partial u(x)}{\partial n}=\phi(x),\quad x\in S,$$
where $n$ is the outward pointing normal at $x$, are called Neumann boundary conditions.
A boundary value problem with Neumann conditions is also called a boundary value problem of the second kind (see Second boundary value problem).
See also First boundary value problem; Dirichlet boundary conditions; Third boundary value problem.
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