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Unbounded harmonic functions on homogeneous manifolds of negative curvature

Richard Penney, Roman Urban (2002)

Colloquium Mathematicae

We study unbounded harmonic functions for a second order differential operator on a homogeneous manifold of negative curvature which is a semidirect product of a nilpotent Lie group N and A = ℝ⁺. We prove that if F is harmonic and satisfies some growth condition then F has an asymptotic expansion as a → 0 with coefficients from 𝓓'(N). Then we single out a set of at most two of these coefficients which determine F. Then using asymptotic expansions we are able to prove some theorems...

Uniform bounds for quotients of Green functions on C 1 , 1 -domains

H. Hueber, M. Sieveking (1982)

Annales de l'institut Fourier

Let Δ u = Σ i 2 x i 2 , L u = Σ i , j a i j 2 x i x j u + Σ i b i x i u + c u be elliptic operators with Hölder continuous coefficients on a bounded domain Ω R n of class C 1 , 1 . There is a constant c > 0 depending only on the Hölder norms of the coefficients of L and its constant of ellipticity such that c - 1 G Δ Ω G L Ω c G Δ Ω on Ω × Ω , where γ Δ Ω (resp. G L Ω ) are the Green functions of Δ (resp. L ) on Ω .

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