Normality-preserving endomorphism-invariant subgroup

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This article defines a subgroup property: a property that can be evaluated to true/false given a group and a subgroup thereof, invariant under subgroup equivalence. View a complete list of subgroup properties[SHOW MORE]

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Definition

A subgroup $H$ of a group $G$ is termed a normality-preserving endomorphism-invariant subgroup if, for every normality-preserving endomorphism $\sigma$ of $G$, $\sigma (H)$ is contained in $H$.

Relation with other properties

Stronger properties

Property	Meaning	Proof of implication	Proof of strictness (reverse implication failure)	Intermediate notions
Fully invariant subgroup	invariant under all endomorphisms	fully invariant implies normality-preserving endomorphism-invariant	normality-preserving endomorphism-invariant not implies fully invariant	|FULL LIST, MORE INFO
Normal-homomorph-containing subgroup	any homomorphic image of the subgroup that's normal in the whole group is contained in the subgroup	normal-homomorph-containing implies normality-preserving endomorphism-invariant	normality-preserving endomorphism-invariant not implies normal-homomorph-containing	|FULL LIST, MORE INFO

Weaker properties

Property	Meaning	Proof of implication	Proof of strictness (reverse implication failure)	Intermediate notions
Strictly characteristic subgroup	invariant under all surjective endomorphisms	normality-preserving endomorphism-invariant implies strictly characteristic	strictly characteristic not implies normality-preserving endomorphism-invariant	|FULL LIST, MORE INFO