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Neumann condition

A boundary condition that prescribes the value of a directional derivative of u on the boundary, rather than u itself.

A Neumann condition prescribes the normal derivative \partial u/\partial n on the boundary, e.g. u_x(0,t)=u_x(L,t)=0 for a rod with insulated (no heat flux) ends.

See also

boundary condition Dirichlet condition Robin condition
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