Inverse image condition

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This article defines a subgroup metaproperty: a property that can be evaluated to true/false for any subgroup property
View a complete list of subgroup metaproperties
View subgroup properties satisfying this metaproperty| View subgroup properties dissatisfying this metaproperty
VIEW RELATED: subgroup metaproperty satisfactions| subgroup metaproperty dissatisfactions

BEWARE! This term is nonstandard and is being used locally within the wiki. [SHOW MORE]
This article is about a general term. A list of important particular cases (instances) is available at Category: Subgroup properties satisfying inverse image condition


Symbol-free definition

A subgroup property is said to satisfy the inverse image condition if, for any homomorphism of groups, the inverse image of a subgroup satisfying the property in the group on the right, satisfies the property in the group on the left.

Definition with symbols

Let p be a subgroup property. We say that p satisfies the inverse image condition if for any homomorphism \phi: G \to H, the following holds: whenever N is a subgroup satisfying p in H, \phi^{-1}(N) satisfies p in G.

Relation with other metaproperties

Weaker metaproperties