The pyramidal block element

摘要

In [1], we considered a block element shaped as a rectangular parallelepiped by the example of a bound-ary-value problem for the anisotropic equation. It can be introduced for describing the solutions of bound-ary-value problems at strictly internal points of the region or on a plane boundary. Near a nonplanar boundary, it is inefficient. For describing such bound-aries, we introduced below a block element shaped as a rectangular pyramid occupying the region Ω in the space R3. The rectangular-pyramid edges are the axes of the rectangular coordinate system xo, (x1, x2, x3, o), with the origin at the point o, and the inclined facet is described by a plane in pieces on the axes.