center_polygon.m deleterepeatedrows.m entryInWhichRows.m exact_solution.m f.m face_middlepoint.m getEdges.m getFaces.m license.txt meshes.jpg picture_paper.m rhs_CR_3D.m rotate_intersection_elements.m show_mesh.m show_middlepoints.m show_points.m show_vertices.m start.m stima_gradgradCR_3D.m stima_massCR_3D.m tetrarefine3.m