Can someone please explain in detail? Do I need to find a subgroup of $\mathbb{R}$ that is all the multiples of 7?
2025-01-12 23:42:15.1736725335
What are the elements of the subgroup of $\mathbb{R}^*$ generated by 7?
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For any $a\in\Bbb R^*$, $$\langle a\rangle=\{a^n:n\in\Bbb Z\}.$$