Introductory remarks

$\Bbb Z/n\Bbb Z$ as a quotient

$\Bbb Z/n\Bbb Z$ as a quotient group

$G/H$ generalizes $\Bbb Z/n\Bbb Z$

The operation $\textcircled\star$ on $G/H$

Normal subgroups

Normal subgroup exercises

Fibers are cosets

Cosets are fibers