# Group in which every normal subgroup is characteristic

This article defines a group property: a property that can be evaluated to true/false for any given group, invariant under isomorphism
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## Definition

### Symbol-free definition

A group in which every normal subgroup is characteristic is a group such that every normal subgroup of the group is characteristic in the group.

## Formalisms

### In terms of the subgroup property collapse operator

This group property can be defined in terms of the collapse of two subgroup properties. In other words, a group satisfies this group property if and only if every subgroup of it satisfying the first property (normal subgroup) satisfies the second property (characteristic subgroup), and vice versa.
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The property can be viewed as the following subgroup property collapse: normal subgroup = characteristic subgroup

### In terms of the supergroup property collapse operator

This group property can be defined in terms of the collapse of two subgroup properties in the following sense. Whenever the given group is embedded as a subgroup satisfying the first subgroup property (normal subgroup), in some bigger group, it also satisfies the second subgroup property (transitively normal subgroup), and vice versa.
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The property can be viewed as the following collapse: $G$ satisfies the property if and only if whenever $G$ is embedded as a normal subgroup of some group $K$, then $G$ is a transitively normal subgroup of $K$.

### In terms of the automorphism property collapse operator

This group property can be defined in terms of the collapse of two automorphism properties. In other words, a group satisfies this group property if and only if every automorphism of it satisfying the first property (automorphism) satisfies the second property (normal automorphism), and vice versa.
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