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33 votes

Are infinite dimensional constructions needed to prove finite dimensional results?

In his famous proof of the Poincare conjecture, Perelman heuristically derived a key monotonicity formula for finite-dimensional Ricci flow, by interpreting this flow as a renormalised version of an i …
Terry Tao's user avatar
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19 votes

Ricci Curvature in infinite dimensions?

There is a paper of Lott and Villani that defines the concept of nonnegative Ricci curvature in an arbitrary measured length space: http://math.berkeley.edu/~lott/LottVillani.pdf There is a dimensio …
Terry Tao's user avatar
  • 114k