I am learning someting on lattices in algebraic groups. My question might be formulated as follows: consider the algebraic group $\mathrm{SL}_2\times \mathrm{SL}_2$, what are the $\mathbb{Q}$-forms of such groups.
$\mathbb{Q}$-forms of $\mathrm{SL}_2\times \mathrm{SL}_2$
C.C.
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