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Published online by Cambridge University Press: 20 November 2018
Suppose that $G$ is a finite group and
$H$ is a subgroup of
$G$.
$H$ is said to be
$s$-semipermutable in
$G$ if
$H{{G}_{p}}\,=\,{{G}_{p}}H$ for any Sylow
$p$-subgroup
${{G}_{p}}$ of
$G$ with
$\left( p,\,\left| H \right| \right)\,=\,1$;
$H$ is said to be
$s$-quasinormally embedded in
$G$ if for each prime
$p$ dividing the order of
$H$, a Sylow
$p$-subgroup of
$H$ is also a Sylow
$p$-subgroup of some
$s$-quasinormal subgroup of
$G$. In every non-cyclic Sylow subgroup
$P$ of
$G$ we fix some subgroup
$D$ satisfying
$1\,<\,\left| D \right|\,<\,\left| P \right|$ and study the structure of
$G$ under the assumption that every subgroup
$H$ of
$P$ with
$\left| H \right|\,=\,\left| D \right|$ is either
$s$-semipermutable or
$s$-quasinormally embedded in
$G$. Some recent results are generalized and unified.