Index( G, U )
Let U be a subgroup of G. Then Index
returns the index of U in
G as an integer.
Note that Index
sets and checks U.index
if G is the parent group
of U.
gap> s4 := Group( (1,2,3,4), (1,2) ); Group( (1,2,3,4), (1,2) ) gap> Index( s4, DerivedSubgroup( s4 ) ); 2
The default function GroupOps.Index
needs a finite group G. It
returns the quotient of Size( G )
and Size( U )
.
GAP 3.4.4