Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: All subgroup of S3

  1. May 13, 2012 #1
    The question wants all subgroups of S3 .


    If H≤S 3 , then ; IHI=1,2,3,6 by Lagrance's Theorem.

    In other words, order of H can be 1,2,3 and 6.

    What ı want to ask is how to write subgroup of S3. For example,is H 1 (1) ?
     
  2. jcsd
  3. May 13, 2012 #2

    HallsofIvy

    User Avatar
    Science Advisor

    For "[itex]H_1[/itex]", yes, any subgroup must contain the identity so if H contains only one member, it must be just the identity permutation, (1).

    There are, in fact, 3 different subgroups of order 2: {e, (12)}, {e, (13)}, and {e, (23)}. There is the single subgroup of order 3: {e, (123), (132)}. Of course, the subgroup of order 6 is the entire group.
     
  4. May 14, 2012 #3
    What can H5 be?
     
  5. May 14, 2012 #4

    HallsofIvy

    User Avatar
    Science Advisor

    ??? You just said that every subgroup of S3 (every subgroup of any group of order 6) must have order 1, 2, 3, or 6 (a divisor of 6). What do you mean by "H5"?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook