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user 69185
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Finding invariant closed subspace which are also subgroups for the action of $\text{SL}(2, \...
I recently came across to the following action of $\text{SL}(2,\Bbb Z)$ on the space $\Bbb R^n\times\Bbb R^n$ defined as
$$
\begin{pmatrix}
a & b \\
c & d
\end{pmatrix}\cdot \big(v,\,w\big)\mapsto \b …
- 203