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Apr 25 at 8:06 comment added Elías Guisado Villalgordo I recommend looking at Vakil's Foundations of Algebraic Geometry, 6.6.1, for a picture (version of 21/2/24).
Apr 25 at 7:55 comment added Elías Guisado Villalgordo (In the Stacks Project, they use the term thickening for what you call “nilpotentification.”)
Jan 28, 2010 at 17:00 answer added Emerton timeline score: 22
Jan 28, 2010 at 13:02 answer added Cam McLeman timeline score: 20
Jan 28, 2010 at 11:26 history asked user3575 CC BY-SA 2.5