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I've found a reference to "ancient time" from Google.

It's mentioned in e.g. the book Sobolev Inequalities, Heat Kernels under Ricci Flow, and the Poincare Conjecture, by Qi S. Zhang.

E.g.

The second case is when the manifold $M$ is compact and has positive sectional curvature everywhere. Let $t_0$ be a very ancient time.

What's "ancient time" and why is the name such?

mavavilj
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  • It's talking about ancient solution to the Ricci flow, which is a family ${g_{ij}(t): t\in (-\infty, c]}$ of Riemannian metric on $M$ so that $\partial_t g_{ij} = 2\text{Ric}(g).$ I believe by very ancient time it means just a very negative $t$. –  Nov 30 '15 at 06:05
  • I wonder if the "very" qualifier makes it even something more different than just "ancient time"? – mavavilj Nov 30 '15 at 06:07
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    http://www.poemhunter.com/poem/and-did-those-feet-in-ancient-time/ – Will Jagy Nov 30 '15 at 06:10

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