Riemannian geometry, on Earth, was proposed by the German mathematician Riemann at the University of Göttingen. This is an extension of Euclid's fifth postulate, an expansion of Euclidean plane geometry.
Due to a mysterious correlation between the two worlds, or perhaps merely a perverse amusement of some Heavenly Dao, this geometry with positive curvature is also referred to as "Riemannian Geometry" or "Li's Geometry" in Shenzhou. The Carefree Practitioners of Wanfa Sect and the Surface Sky Demon Riemann achieved enlightenment through this geometry.
Riemannian geometry is the mathematical foundation of general relativity, used to describe the spacetime model of general relativity. "The essence of gravity is the curvature of spacetime," and this "curvature" refers to the curvature in Riemannian geometry.
Thus, Ai Changyuan also incorporated Riemannian geometry into the Sky Collapsing Palm, enabling him to master this miraculous technique during the Qi Cultivation Stage.