Warped geometry are useful in that separation of variables
The geometry decomposes almost into a Cartesian product of the y geometry. Warped geometries are useful in that separation of variables, acquire full meaning. The Then d factor of the spatial dimension becomes the effect of time that in words of Einstein. Many basic solutions of the Einstein field equations are warped geometries for the Friedmann and the Schwarzschild solution for example.
Calculus is the mathematical study of continuous change, a part of modern mathematics education