Problem 4. Let G = A4. (1) List all of subgroups of G with order 2 or 3. (2) Explain why G has no subgroup of order 6. (3) Find the subgroup H of order 4.

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Problem 4. Let G = A4.

(1) List all of subgroups of G with order 2 or 3.

(2) Explain why G has no subgroup of order 6.

(3) Find the subgroup H of order 4.

(4) List all left cosets of H in G.

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Step 1

  G = A4 = { I , (123) , (132) , (124) , (142),                      (134) , (143) , (234) , (243) ,                         (12)(34) , (13)(24) , (23)(14) }

(1).  Subgroup of order 2:

  • H1= { I , (12)(34) }
  • H2= { I , (13)(24) }
  • H3= { I , (23)(14) }

       Subgroup of order 3:

  • H1= { I , (123) , (132) }
  • H2= { I , (124) , (142) }
  • H3= { I , ( 134) , (143) }
  • H4= { I , ( 234) , (243) }
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