Per example 1.33 on page 13 in this document, how does an element of SL(2,$\mathbb{Z}$) act on the plane in a way that could be a homothety? Is it via matrix multiplication or as a linear fractional transformation?
2026-03-27 07:14:44.1774595684
An element of SL(2, $\mathbb{Z}$) as a homothety
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