The Rayleigh-Ritz method seeks a stationary point of a variational functional. For operators which are self-adjoint and positive-definite, the stationary point of the functional,

is an exact solution of (2.1), assuming . In (2.4) the inner product of the two vector functions is defined as,

(2.5) |

The functional reaches a minimum for the function , if the first variation is zero for this function, or equivalently,

(2.6) |

H. Ceric: Numerical Techniques in Modern TCAD