I know that $H\cong K$ may not imply $G/H\cong G/K$ as a counter-example take $G=\Bbb{Z}$, $H=2\Bbb{Z}$ and $K=3\Bbb{Z}$, $G/H=\Bbb{Z}_2\ncong\Bbb{Z}_3=G/K$.
But I cannot get whether $G/H\cong G/K$ implies $H\cong K$.
Can anybody help me in this regard? Thanks for the assistance in advance.
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1EDIT: This is a better target: https://math.stackexchange.com/q/1584568/631742 – Maximilian Janisch Mar 28 '20 at 09:52