# qc

• 2015, Yun Shi, Wei Wang, “On Conformal Qc Geometry, Spherical Qc Manifolds and Convex Cocompact Subgroups of ${\displaystyle {\rm {Sp}}{(n+1,1)}}$”, in arXiv[1]:
As a corollary, we prove that such a spherical qc manifold is scalar positive, negative or vanishing if and only if the Poincaré critical exponent of the discrete subgroup is less than, greater than or equal to ${\displaystyle 2n+2}$, respectively..