If a Minimal Surface is given by the equation and has Continuous first and second Partial Derivatives for all Real and , then is a Plane.

**References**

Hazewinkel, M. (Managing Ed.). *Encyclopaedia of Mathematics: An Updated and Annotated Translation
of the Soviet ``Mathematical Encyclopaedia.''* Dordrecht, Netherlands: Reidel, p. 369, 1988.

© 1996-9

1999-05-26