The use of Cauchy's method to prove Euler's well-known formula is an object many controversies. purpose this paper that applies for convex polyhedra and not only them, but also surfaces such as the torus, projective plane, Klein bottle pinched torus.

Abstract Citation-based Information Retrieval (IR) methods for scientific documents have proven effective IR applications, such as Plagiarism Detection or Literature Recommender Systems in academic disciplines that use many references. In science, technology, engineering, and mathematics, researchers often employ mathematical concepts through formula notation to refer prior knowledge. Our long-...