Uniform estimates of Green functions and Sobolev-type inequalities on real and complex manifolds

We prove certain L p Sobolev-type and Poincaré-type inequalities for functions on real and complex manifolds for the gradient operator ∇, the Laplace operator Δ, and the operator [Formula: see text]. Integral representations for functions are key to get such inequalities. The proofs of the main results involves certain uniform estimates for the Green functions and their gradients on Riemannian manifolds, which are also established in the present work.