What does ${\Bbb Z}_m^*$ mean? I know that $\Bbb Z_m$ is isomorphic to $\Bbb Z/m \Bbb Z$ but the asterisk tripped me up.
2026-04-06 18:37:42.1775500662
Notation in modulo groups
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It depends on context, but usually it means the group of multiplicative units in $\mathbb{Z}_m$ (here thought of as a ring, rather than merely an abelian group).