Keivan Karai
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 Jan 29 awarded Yearling Dec 20 awarded Popular Question Dec 18 accepted $p$-adic orthogonal groups in four variables Dec 16 asked $p$-adic orthogonal groups in four variables Nov 21 comment Bounds on the number of zeros of a quadratic form Thanks! I guess I have sorted out the situation using your previous comments. Nov 20 comment Bounds on the number of zeros of a quadratic form Thanks a lot for the references! I will look them up. Nov 19 comment Bounds on the number of zeros of a quadratic form Thanks for the reference. I mentioned that particular form as an example, but I am indeed interested in dimensions 3 and 4. I will look up Fricke and Klein. Nov 19 comment Bounds on the number of zeros of a quadratic form Will Jagy: Here is an example: Take (say) the form $Q(x,y,z)=x^2+y^2-5z^2$. Suppose I want to have solutions $(x,y,z)$ to $Q(x,y,z)=0$ such that $x$ is not divisible by a certain prime number $p$. Is there a guarantee I can get $cT log T$ of them with \$|x|,|y|,|z|