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Aug 29, 2014 at 3:55 vote accept YHBKJ
Aug 28, 2014 at 20:04 comment added Mark Gross This is a codimension one condition, so one has a nineteen dimensional family of such K3 surfaces. There will be a countable number of 18 dimensional subfamilies of algebraic elliptic K3 surfaces.
Aug 28, 2014 at 14:08 comment added YHBKJ So is it frequent for a K3 surface to have such an isotropic vector?
Aug 28, 2014 at 10:52 history answered Atsushi Kanazawa CC BY-SA 3.0