# Math Help - permutation

1. ## permutation

Can I ask one thing? I am really sorry.

I have a = ( 1 2 3 4 5 6 7 ) and r = (1 2 3 4 5 6 7 )
3 2 6 7 4 1 5 3 6 5 2 7 4 1

if I want to get ar = should I start with r? so 1 -> 3 -> 6 ?

I thought I need to start with r, but some books says it starts with a

2. ## Re: permutation

Originally Posted by yanirose
Can I ask one thing? I am really sorry.

I have a = ( 1 2 3 4 5 6 7 ) and r = (1 2 3 4 5 6 7 )
3 2 6 7 4 1 5 3 6 5 2 7 4 1

if I want to get ar = should I start with r? so 1 -> 3 -> 6 ?

I thought I need to start with r, but some books says it starts with a

ar(x) = a(r(x))

so I think you should start with r as you've done i.e. 1 -> 3 -> 6, 2 -> 6 -> 1, etc.

Product or Composite of Two Permutations

3. ## Re: permutation

Hi, Thanks

but the link you gave me says ar is a first and the r...?

4. ## Re: permutation

Originally Posted by yanirose
Can I ask one thing? I am really sorry.

I have a = ( 1 2 3 4 5 6 7 ) and r = (1 2 3 4 5 6 7 )
3 2 6 7 4 1 5 3 6 5 2 7 4 1
if I want to get ar = should I start with r? so 1 -> 3 -> 6 ?
$\alpha = \left( {\begin{array}{*{20}{c}}1&2&3&4&5&6&7\\3&2&6&7&4&1 &5\end{array}} \right)\,\& \,\rho = \left( {\begin{array}{*{20}{c}}1&2&3&4&5&6&7\\3&6&5&2&7&4 &1\end{array}} \right)$