“…where l(s), m(s), U(t), V(t), f , and g are C 1 functions. Since there is no restriction attached to the given curve in Equations ( 15), (17), or (19), the surface family with Ī²(s) as the mutual geodesic, can constantly be established by choosing suitable marching-scale functions. Clearly, Equations ( 13), ( 15), ( 17) and ( 19) are more convenient and elegant for implementations than those reported [14].…”