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Aug 3, 2022 at 19:03 history edited Glorfindel CC BY-SA 4.0
broken link fixed, cf. https://meta.mathoverflow.net/q/5301/70594
Mar 20, 2010 at 18:06 comment added José Figueroa-O'Farrill Interesting. I don't work in this area, but Calderbank and Singer are friends and got to know about their results (and the earlier one I mentioned) through talking to them.
Mar 20, 2010 at 17:02 comment added Jason DeVito - on hiatus On a somewhat related note, Sha and Yang have shown the for $n$ and $m \geq 2$, the connect sum of $S^n\times S^m$ with itself an infinite number of times carries a metric of positive Ricci curvature. I don't think these metrics are Einstein, though.
Mar 20, 2010 at 16:00 history answered José Figueroa-O'Farrill CC BY-SA 2.5