Hi GAP forum members,
For the unary version of `Subgroup`, i am using it like this:
```
gap> g:=Group((1,2,3,4),(1,2));;
gap> f:=Subgroup(g)
<group>
```
Reading in the documentation it says:
> The unary version of Subgroup creates a (shell) subgroup that does
not even know generators but can be used to collect information about a
particular subgroup over time.
I don't understand what this means, can someone explain this? In
particular the statement "collect information over time", sounds very
unknown to me from GAP user perspective.
Thanks
Gaurav
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