Dirichlet boundary conditions
Dirichlet conditions, Dirichlet data, boundary conditions of the first 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 form
$$u(x)=\phi(x),\quad x\in S,$$
are called Dirichlet boundary conditions.
A boundary value problem with Dirichlet conditions is also called a boundary value problem of the first kind (see First boundary value problem).
Dirichlet boundary conditions. Encyclopedia of Mathematics. URL: http://www.encyclopediaofmath.org/index.php?title=Dirichlet_boundary_conditions&oldid=33678