I'm trying to show whether the form $x_1^2 + x_2^2 -15(x_3^2+x_4^2)$ is isotropic over $\mathbb{Q}$. I tried to apply the strong Hasse principle, but I don't get how to show isotropicity over $\mathbb{Q}_p$
2026-04-06 04:56:21.1775451381
Determine if the form $x_1^2 + x_2^2 -15(x_3^2+x_4^2)$ is isotropic over $\mathbb{Q}$.
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