C-subnormal subgroup

Origin
The notion of c-subnormal subgroup was considered by Jaraden Jehad in a paper in 2000. Later, an equivalent notion of weakly c-normal subgroup was introduced in a joint paper by Zhu, Guo and Shum in 2002, as a notion closely related to subnormal subgroups and to c-normal subgroups (a notion introduced by Wang in 1996).

Stronger properties

 * Normal subgroup
 * C-normal subgroup