General variational principles applicable to the hybrid element method.
Functional valued operators are used to formulate diffraction problems in a general abstract form. Variational principles for this formulation are developed. They are then applied to derive results on the linearized theory of free surface flows previously reported. Applications are also made to potential theory and elasticity.
Herrera
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Institute for Research in Applied Mathematics and Systems, National University of México, Apdo. Postal 20-726, México 20, D. F. Mexico.