3 papers
math-ph2016
Some Conformal Positive Mass Theorems
Luen-Fai Tam, Qizhi Wang
W. Simon proved a conformal positive mass theorem, which was used to prove uniqueness of black holes later. In this note, we will generalize Simon's conformal positive mass theorem…
math.GM2014
A Search of The Four-Color Theorem and its Higher Dimensional Generalization
Qizhi Wang
Four-Color Theorem has secret in its logical proof and actual operating. In this paper we will give a proof of Four-Color Theorem based on Kuratowski's Theorem using some induction…
math-ph2014
Harmonic spinors on axisymmetric 3-manifolds with Melvin ends
A. K. M. Masood-ul-Alam, Qizhi Wang
We prove the existence of harmonic spinor fields in axisymmetric Riemannian 3-manifolds having nonnegative scalar curvature and asymptotic to the usual constant time hypersurface o…