Liouville surface

In the mathematical field of differential geometry a Liouville surface is a type of surface which in local coordinates may be written as a graph in R³

z=f(x,y)

such that the first fundamental form is of the form

ds^{2}={\big (}f_{1}(x)+f_{2}(y){\big )}\left(dx^{2}+dy^{2}\right).\,

Sometimes a metric of this form is called a Liouville metric. Every surface of revolution is a Liouville surface.

References

Gelfand, I.M. & Fomin, S.V. (2000). Calculus of variations. Dover. ISBN 0-486-41448-5. (Translated from the Russian by R. Silverman.)
Guggenheimer, Heinrich (1977). "Chapter 11: Inner geometry of surfaces". Differential Geometry. Dover. ISBN 0-486-63433-7.

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