Quotient-transitive and stronger than normality implies complementary property is transitive
Statement
Suppose is a subgroup property stronger than the property of being a normal subgroup. Further, suppose is a quotient-transitive subgroup property: in other words, if are such that satisfies in and satisfies in , then also satisfies in .
Consider the subgroup property defined as follows: a subgroup of a group satisfies in if has a permutable complement in satisfying in . Then, is a transitive subgroup property: if are groups such that satisfies in and satisfies in , then also satisfies in .