Prove that for any k ? 2, a k–cycle can be expressed as a composition of exactly k ? 1 2–cycles.
We apply induction on k
For k=2
which is 1'' 2-cycle
Now Assume result hold for each n
Now consider
Where so by Induction hypothesis can be break down in (k-2), 2-cycles
Henceforth can be break down in to (k-1) 2-cycles which proves our assertion
Note breaking of is like
For examples
1) (123)=(13)(12)
2)(2345)=(25)(24)(23)
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