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Feb 21, 2022 at 14:54 answer added rita timeline score: 2
Feb 4, 2022 at 4:39 answer added Tom Mrowka timeline score: 7
Feb 3, 2022 at 4:54 history became hot network question
Feb 3, 2022 at 1:29 answer added Will Sawin timeline score: 15
Feb 2, 2022 at 23:51 history edited John Baez CC BY-SA 4.0
made wording more precise
Feb 2, 2022 at 22:57 comment added Jonny Evans If you take homogeneous coordinates a,b,c on P^2 and x,y on P^1 then a surface cut out by a polynomial which is of bidegree 3,2 will give you a K3 (e.g. a sum of monomials like abcxy). The projection to the P^1 factor will have fibres that are cubics in P^2. You could try playing with these to get different combinations of singular fibres.
Feb 2, 2022 at 20:53 history asked John Baez CC BY-SA 4.0