Divisibility-closed subgroup of abelian group: Difference between revisions
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==Definition== | ==Definition== | ||
A [[subgroup]] <math>H</math> of a [[group]] <math>G</math> is termed a '''divisibility-closed subgroup of abelian group''' if <math>G</math> is an [[abelian group]] and <math>H</math> is a [[divisibility-closed subgroup]] of <math>G</math>, i.e., for any [[prime number]] <math>p</math> such that <math>G</math> is a <math>p</math>-[[divisible group for a set of primes|divisible]] group, | A [[subgroup]] <math>H</math> of a [[group]] <math>G</math> is termed a '''divisibility-closed subgroup of abelian group''' if <math>G</math> is an [[abelian group]] and <math>H</math> is a [[divisibility-closed subgroup]] of <math>G</math>, i.e., for any [[prime number]] <math>p</math> such that <math>G</math> is a <math>p</math>-[[divisible group for a set of primes|divisible]] group, we have that <math>H</math> is also a <math>p</math>-divisible group. | ||
==Relation with other properties== | ==Relation with other properties== | ||
Latest revision as of 03:58, 2 April 2013
This article describes a property that arises as the conjunction of a subgroup property: divisibility-closed subgroup with a group property imposed on the ambient group: abelian group
View a complete list of such conjunctions | View a complete list of conjunctions where the group property is imposed on the subgroup
Definition
A subgroup of a group is termed a divisibility-closed subgroup of abelian group if is an abelian group and is a divisibility-closed subgroup of , i.e., for any prime number such that is a -divisible group, we have that is also a -divisible group.
Relation with other properties
Stronger properties
| Property | Meaning | Proof of implication | Proof of strictness (reverse implication failure) | Intermediate notions |
|---|---|---|---|---|
| completely divisibility-closed subgroup of abelian group | ||||
| verbal subgroup of abelian group | verbal subgroup of abelian group implies divisibility-closed |
Weaker properties
| Property | Meaning | Proof of implication | Proof of strictness (reverse implication failure) | Intermediate notions |
|---|---|---|---|---|
| powering-invariant subgroup of abelian group | the subgroup is a powering-invariant subgroup and the group is abelian | divisibility-closed implies powering-invariant | |FULL LIST, MORE INFO | |
| divisibility-closed subgroup of nilpotent group | divisibility-closed and the whole group is a nilpotent group | abelian implies nilpotent | nilpotent not implies abelian, use the whole group as a subgroup of itself | |FULL LIST, MORE INFO |
| powering-invariant subgroup of nilpotent group | |FULL LIST, MORE INFO | |||
| divisibility-closed subgroup | |FULL LIST, MORE INFO | |||
| powering-invariant subgroup | |FULL LIST, MORE INFO |