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Note: I have already posted this on stackexchange, but have not yet gotten a response.

What are some good references for the Gauss composition law on binary quadratic forms in terms of Galois Cohomology?

I guess to be more general, I should ask for an exposition in terms of etale cohomology, but the etale cohomology is exactly the Galois cohomology in the number field case anyhow.

Thanks.

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    $\begingroup$ Stackexchange question: math.stackexchange.com/questions/671942/… $\endgroup$
    – Noah Schweber
    Commented Feb 12, 2014 at 6:01
  • $\begingroup$ right, that's the one that I asked mentioned in the above post (thank you for linking it; I suppose I should have done that). $\endgroup$
    – Johannas
    Commented Feb 12, 2014 at 6:06

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