A Coons patch is characterized by a finite set of boundary curves, which are dependent on the choice blending functions. For bicubically blended (BBCP), Hermite cubic polynomials (interpolants) used as BBCP comprises information about its four corner points, including curvature represented eight tangent vectors, well twisting behavior determined twist vectors at these points. The interior shape...

With the question, “Can relativistic charged spheres form extremal black holes?” in mind, we investigate the properties of such spheres from a classical point of view. The investigation is carried out numerically by integrating the Oppenheimer-Volkov equation for relativistic charged fluid spheres and finding interior Reissner-Nordström solutions for these objects. We consider both constant den...