by

Ciro Santilli (@cirosantilli, 37)

Group extension problem

Besides the understandable Wikipedia definition, Video "Simple Groups - Abstract Algebra by Socratica (2018)" gives an understandable one:

Given a finite group $F$ and a simple group $S$ , find all groups $G$ such that $N$ is a normal subgroup of $G$ and $G / N = S$ .

We don't really know how to make up larger groups from smaller simple groups, which would complete the classification of finite groups:

math.stackexchange.com/questions/25315/how-is-a-group-made-up-of-simple-groups

In particular, this is hard because you can't just take the direct product of groups to retrieve the original group: Section "Relationship between the quotient group and direct products".

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