Strongly UL-intersection-closed subgroup property

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This article defines a subgroup metaproperty: a property that can be evaluated to true/false for any subgroup property
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Definition

A subgroup property $p$ is termed strongly UL-intersection-closed if for any group $G$, any (possibly empty) indexing set $I$, and subgroups $H_i \le K_i \le G, i \in I$, such that $H_i$ satisfies property $p$ in $K_i$ for each $i \in I$, we have:

$\bigcap_{i \in I} H_i$ satisfies property $p$ in $\bigcap_{i \in I} K_i$.

A subgroup property is strongly UL-intersection-closed if and only if it is both UL-intersection-closed and identity-true.

Relation with other metaproperties

Weaker metaproperties

• UL-intersection-closed subgroup property
• Strongly intersection-closed subgroup property
• Intersection-closed subgroup property
• Transfer condition
• Intermediate subgroup condition