Talk:Abstract Algebra/Group Theory/Permutation groups

it seems the notation of (a b) comes out of no where when discussing theorem 9. it turns out being a notation to describe a transposition where a and b are transposed. in this case,

$$ \sigma(a) = b,\ \sigma(b) = a,\ \sigma(x) = x,\ when\ x \neq a\ and\ x \neq b $$

quite confusing if this notation is not mentioned anywhere. HuStmpHrrr (discuss • contribs) 02:02, 9 September 2016 (UTC)