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Oct 3, 2019 at 6:22 comment added Emil Jeřábek By Sidney Raffer’s answer (or rather, his comment below his answer), the conjecture as written is false.
Sep 17, 2019 at 21:22 comment added GH from MO For the case of ternary quadratic forms, see mathoverflow.net/questions/341845/…
Sep 17, 2019 at 16:30 history edited user44143 CC BY-SA 4.0
barely non-trivial edits
Sep 9, 2019 at 18:52 history edited user44143 CC BY-SA 4.0
added proof of conjecture mod p^r
Sep 5, 2019 at 15:30 history edited user44143 CC BY-SA 4.0
added more data on conjecture
Aug 23, 2019 at 15:07 comment added Will Sawin For my question (local obstructions all take the specified form) I think it can be proved in an arbitrary number of variables. I will write this up shortly.
Aug 23, 2019 at 14:28 comment added user44143 @WillSawin, I am hoping that the three-variable case can be solved by people who know the theory of ternary quadratics better than I do. I may work on reducing the four-variable case or higher to the three-variable case.
Aug 23, 2019 at 13:09 comment added Will Sawin Can you prove that the equation is locally soluble if and only if the constant coefficient is a multiple of the gcd of the others?
Aug 23, 2019 at 12:13 history answered user44143 CC BY-SA 4.0