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Type II ancient solutions to the Ricci flow on surfaces. (English) Zbl 1120.53040

The author studies the backward limit and the circumference at spatial infinity of Type II ancient solutions to the Ricci flow on noncompact two-dimensional surfaces. In particular, he proves that the circumference at spatial infinity of such a solution is finite and independent of time and that \(\lim_{t \to -\infty}R_{\max} R(t) >0\) where \(R_{\max}= \sup R(\cdot,t)\).

MSC:

53C44 Geometric evolution equations (mean curvature flow, Ricci flow, etc.) (MSC2010)