Picture below is from Topping's Lectures on the Ricci flow. I don't know what is the 3-dimensional toroidal. Is it $$ T^3 = S^1\times S^1 \times S^1 ~~~~? $$ Besides, how to construct a metric on it such that the sectional curvature is $-1$ ?
2026-04-07 09:36:36.1775554596
What is 3-dimensional toroidal?
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