As the title indicates, I want to ask what is the Borel subgroup of $SL_2(\mathbb{Z})$? I believe I read about it in one of James Milne's notes. But now I cannot find it. That is why I want to ask.
2026-03-26 01:03:23.1774487003
Borel subgroup of $SL_2(\mathbb{Z})$
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