= Quotient group
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Ultimate explanation: https://math.stackexchange.com/questions/776039/intuition-behind-normal-subgroups/3732426#3732426
Does not have to be isomorphic to a subgroup:
* https://www.mathcounterexamples.net/a-semi-continuous-function-with-a-dense-set-of-points-of-discontinuity/
* https://math.stackexchange.com/questions/2498922/is-a-quotient-group-a-subgroup
This is one of the reasons why the analogy between <simple groups> of finite groups and <prime numbers> is limited.
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