If **x** is a regular patch on a Regular Surface in with normal , then

(1) | |||

(2) | |||

(3) |

where , , and are coefficients of the second Fundamental Form and are Christoffel Symbols of the Second Kind.

**References**

Gray, A. *Modern Differential Geometry of Curves and Surfaces.* Boca Raton, FL: CRC Press, pp. 398-400, 1993.

© 1996-9

1999-05-25