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Dec 18, 2013 at 22:30 vote accept Hiro
Dec 18, 2013 at 22:30 comment added Hiro Thank you for the answer. To clarify your answer, the map is dominant because the curve has a singularity and the pull-back 2-form extends because the singularity of the ruled surface is of codimension 2.
Dec 18, 2013 at 22:19 vote accept Hiro
Dec 18, 2013 at 22:20
Dec 18, 2013 at 16:34 history answered abx CC BY-SA 3.0