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Louis
  • Member for 4 years, 7 months
  • Last seen more than 3 years ago
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On relating $l(A), l(B)$ and $l(A+B)$ for Weil divisors on a smooth projective curve where one of the divisors is effective
Agh yes of-course I should have added that both my divisors have positive degree (otherwise, as you say, it's very easy to get counterexamples) ... what would be a counterexample with a divisor of positive degree ?
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Split extension of finite group and Sylow subgroup by abelian $p$-group
@Derek Holt: thanks for the awesome reference ... could you slightly elaborate the point why the restriction map $H^2(G/A, A)\to H^2(P/A, A)$ is injective ? Is there any references for this ?
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Split extension of finite group and Sylow subgroup by abelian $p$-group
@Geoff Robinson: unfortunately, I don't know any German ... could you please provide a proof as an answer ? Thanks
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Split extension of finite group and Sylow subgroup by abelian $p$-group
@Geoff Robinson: Thank you very much for your comment , and I'm okay to use Group Cohomology (as I have also given the tag ...) ... could you please detail out a proof or give any reference ? Thanks again
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