Hyperbolic Variables on Lorentz Surfaces
In this chapter we start from two fundamental memoirs of Gauss  and Beltrami  on complex variables on surfaces described by a definite quadratic form. By using the functions of a hyperbolic variable, we extend the results of the classic authors to surfaces in space-times described by non-definite quadratic forms.
KeywordsQuadratic Form Complex Variable Conformal Mapping Line Element Euclidean Plane
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