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In [[mathematics]], in the field of [[group theory]], a [[subgroup]] <math>H</math> of a [[group (mathematics)|group]] <math>G</math> is called '''c normal''' if there is a [[normal subgroup]] <math>T</math> of <math>G</math> such that <math>HT = G</math> and the intersection of <math>H</math> and <math>T</math> lies inside the [[normal core]] of <math>H</math>. | |||
For a '''weakly c normal subgroup''', we only require <math>T</math> to be [[subnormal subgroup|subnormal]]. | |||
Here are some facts on c normal subgroups: | |||
*Every [[normal subgroup]] is c normal | |||
*Every [[retract (group theory)|retract]] is c normal | |||
*Every c normal subgroup is weakly c normal | |||
==References== | |||
* Y. Wang, c normality of groups and its properties, Journal of Algebra, Vol. 180 (1996), 954-965 | |||
[[Category:Subgroup properties]] | |||
{{Abstract-algebra-stub}} |
Revision as of 22:10, 31 July 2013
In mathematics, in the field of group theory, a subgroup of a group is called c normal if there is a normal subgroup of such that and the intersection of and lies inside the normal core of .
For a weakly c normal subgroup, we only require to be subnormal.
Here are some facts on c normal subgroups:
- Every normal subgroup is c normal
- Every retract is c normal
- Every c normal subgroup is weakly c normal
References
- Y. Wang, c normality of groups and its properties, Journal of Algebra, Vol. 180 (1996), 954-965