Nonnegativity of the CR Paneitz operator for embeddable CR manifolds
Nonnegativity of the CR Paneitz operator for embeddable CR manifolds
The nonnegativity of the CR Paneitz operator plays a crucial role in three-dimensional CR geometry. In this paper, we prove this nonnegativity for embeddable CR manifolds. This result and previous works give an affirmative solution of the CR Yamabe problem for embeddable CR manifolds. We also show the existence of …