Showing that g^-1 H g is a subgroup

  • Thread starter Thread starter polarbears
  • Start date Start date
  • Tags Tags
    Subgroup
polarbears
Messages
23
Reaction score
0

Homework Statement


If H is a subgroup of G, show that g^{-1}Hg={g^{-1}hg \; h\in H is a subgroup for each g\in G


Homework Equations





The Attempt at a Solution



I know I just have to check for closure and inverses, but the elements in this group g^{-1}hg with different h or with different g?
 
Physics news on Phys.org


Same g for all of them but different h's in H.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
Back
Top