Currently:
def is_subgroup(self):
"""
Return whether the group was defined as a subgroup of a bigger
group.
You can access the containing group with :meth:`ambient`.
OUTPUT:
Boolean.
EXAMPLES::
sage: G = FreeGroup(3)
sage: G.is_subgroup()
False
"""
return self._ambient is not None
But in any sensible derived class i would expect
def is_subgroup(self, other):
"""
Returns "True" if "self" is a subgroup of "other".
"""
The suggestion is to change the name of he first method to
"is_defined_as_subgroup"
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