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Oct 17, 2017 at 6:47 comment added user21574 If $Sc(X) ≥ 0$ and $X$ carries a non-zero harmonic spinor, then $Sc(X) = 0$ and all harmonic spinors on $X$ are parallel. (Lichnerowicz 1963)
Apr 27, 2016 at 23:20 vote accept Brian Klatt
Apr 27, 2016 at 18:30 answer added Danny Ruberman timeline score: 7
Apr 27, 2016 at 18:27 answer added Igor Khavkine timeline score: 7
Apr 27, 2016 at 14:58 history asked Brian Klatt CC BY-SA 3.0