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Timeline for Really rigid varieties

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Oct 13 at 11:32 history made wiki Post Made Community Wiki by Jason Starr
Aug 3, 2011 at 21:25 comment added Francesco Polizzi I think the OP is asking more than rigidity in the large in the usual sense (any deformation of $X_0$ over a connected basis is still $X_0$): he really wants that any flat family with central fiber $X_0$ is trivial. $\mathbb{P}^1$ dos not satisfy this condition, think of Hirzebruch surfaces.
Aug 3, 2011 at 21:14 history answered Jason Starr CC BY-SA 3.0