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Sep 28, 2022 at 5:22 comment added Francesco Polizzi @JasonStarr: thank you very much! I will have a look at this example.
Sep 27, 2022 at 23:35 comment added Jason Starr Probably the surface parameterizing lines on a cubic threefold with an ordinary double point works. I believe the analysis of such specializations is how Clemens-Griffiths originally proved some of their results about the Abel-Jacobi map for cubic threefolds. The specialization was analyzed more carefully in work of Collino . . .
Sep 27, 2022 at 18:57 history edited Francesco Polizzi CC BY-SA 4.0
added 39 characters in body
Sep 27, 2022 at 14:37 history asked Francesco Polizzi CC BY-SA 4.0