Characteristic-isomorph-free subgroup

Definition
A subgroup of a group is termed characteristic-isomorph-free if it is a characteristic subgroup and there is no characteristic subgroup of the whole group isomorphic to it.

Stronger properties

 * Weaker than::Isomorph-free subgroup
 * Weaker than::Normal-isomorph-free subgroup:

Weaker properties

 * Stronger than::Characteristic subgroup: