Abstract
Given a complete Riemannian manifold (M, g) with nonnegative sectional curvature outside a compact subset. Let h be another Riemannian metric which is uniformly equivalent to g. It was shown that the dimension of the space of bounded harmonic functions on (M, h) is finite and is the same as of that under metric g, and the dimension of the space spanned by nonnegative harmonic functions on (M, h) is also finite and is the same as of that under metric g. Moreover, bases were constructed for both spaces on (M, h) and precise estimates were established on the asymptotic behavior at infinity for those basic functions.
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Sung, CJ. Harmonic functions under quasi-isometry. J Geom Anal 8, 143–161 (1998). https://doi.org/10.1007/BF02922112
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DOI: https://doi.org/10.1007/BF02922112