# What is the commutator subgroup of Sn?

## What is the commutator subgroup of Sn?

The commutator subgroup of Sn is equal to An. For n ≥ 5 the commutator subgroup of An is equal to An itself. = (143). shows that for n ≥ 5 every 3-cycle is a commutator of An.

### Is commutator a subgroup Abelian?

The groups generated by S and T satisfying the relations S3 = T2=(ST)i = 1 were classified by Professor Miller, f The fact that makes these groups particularly easy to manage is that the commutator subgroups are abelian. generated by two operators of order two are the well known dihedral groups.

Is the commutator a normal subgroup?

Group Generated by Commutators of Two Normal Subgroups is a Normal Subgroup Let G be a group and H and K be subgroups of G. For h∈H, and k∈K, we define the commutator [h,k]:=hkh−1k−1. Let [H,K] be a subgroup of G generated by all such commutators.

What is commutator subgroup of Q8?

Therefore, the commutator subgroup is the subgroup of Q8 generated by −1 and 1, which is {1, −1}. 2. Since the group C× is abelian, any homomorphism f : Q8 → C× must send the commutator −1=[i, j] to 1.

## What is the commutator used for in group theory?

Commutators are used to define nilpotent and solvable groups and the largest abelian quotient group.

### What is a commutator and what does it do?

Commutator and Brushes The commutator on the DC generator converts the AC into pulsating DC. The commutator assures that the current from the generator always flows in one direction. The brushes ride on the commutator and make good electrical connections between the generator and the load.

How do you prove a commutator subgroup is normal?

generated by the all commutators in G , then for each x∈[G,G] x ∈ [ G , G ] we have x=c1c2⋯cm x = c 1 ⁢ ⁢ ⁢ –a word of commutators– so ci=[ai,bi] c i = [ a i , b i ] for all i ….the derived subgroup is normal.

Title the derived subgroup is normal
Classification msc 20F14

How many subgroups are in Q8?

six subgroups
Thus the six subgroups of Q8 are the trivial subgroup, the cyclic subgroups generated by −1, i, j, or k, and Q8 itself.

## What are the subgroups of Q8?

The subgroups of Q8 are: {1} {1, −1} {1, i, −1, −i} {1, j, −1, −j} {1, k, −1, −k} Q8 The commutator subgroup contains the element [i, j] = iji−1j−1 = ij(−i)(−j)=(ij)(ij) = k2 = −1. Similarly [j, k] = −1 and [k, i] = −1. On the other hand, −1 and 1 commute with all elements of Q8, so [x, −1] = [x, 1] = 1 for all x ∈ Q8.

### What is the commutator subgroup of a group?

The subgroup C of G is called the commutator subgroup of G, and it general, it is also denoted by C = G0or C = [G;G], and is also called the derived subgroup of G. If G is Abelian, then we have C = feg, so in one sense the commutator subgroup may be used as one measure of how far a group is from being Abelian.

Does the product of two commutators have to be a commutator?

However, the product of two or more commutators need not be a commutator. A generic example is [ a, b ] [ c, d] in the free group on a, b, c, d. It is known that the least order of a finite group for which there exists two commutators whose product is not a commutator is 96; in fact there are two nonisomorphic groups of order 96 with this property.

What is the least Order of a finite group with two commutators?

It is known that the least order of a finite group for which there exists two commutators whose product is not a commutator is 96; in fact there are two nonisomorphic groups of order 96 with this property. ) of G: it is the subgroup generated by all the commutators. , where the gi and hi are elements of G.

## Is the set of commutators in G closed under inversion and conjugation?

The first and second identities imply that the set of commutators in G is closed under inversion and conjugation. If in the third identity we take H = G, we get that the set of commutators is stable under any endomorphism of G. This is in fact a generalization of the second identity, since we can take f to be the conjugation automorphism on G,