- Montrer que $~~G\subset \mathbb R^*$
- Montrer que $~~(G,\times)~~$ est un sous groupe de $(~~\mathbb R^\ast,\times~~)$
On note:
$$G=\{~ a+b\sqrt 3,~~(a,b)\in \mathbb{Z}^2,~~/ ~~a^2-3b^2=1~\}$$
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