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Positivity of Ricci curvature under the Kähler--Ricci flow
Dan Knopf, 2005.01.07
http://arxiv.org/abs/math/0501108
For all complex dimensions n>=2, we construct complete Kaehler manifolds of bounded curvature and non-negative Ricci curvature whose Kaehler--Ricci evolutions immediately acquire Ricci curvature of mixed sign.
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