PhysicsUnderg Messages 17 Reaction score 0 Thread starter Jul 8, 2011 #1 For any elements σ, τ ∈ Sn, show that στσ-1τ-1 ∈ An.
micromass Staff Emeritus Science Advisor Homework Helper Insights Author Messages 22,170 Reaction score 3,335 Jul 8, 2011 #2 What did you try already?? Just calculate the sign of the element.