# $f:\mathbb R \to \mathbb R$ continuous, with a point of odd period, implies existence of a point of even period

$f:\mathbb R \to \mathbb R$ continuous, with a point of odd period, implies existence of a point of even period

This is the question. I can't prove it. It's an exercise to prove Sarkovskii theorem, but it on I have to do this part and I'm ready.

-
In math.stackexchange.com/questions/2901/period-of-3-implies-chaos there are useful links –  Ross Millikan Oct 28 '11 at 18:17
What does "it on I have to do this part and I'm ready" mean? and what are you ready for? –  Gerry Myerson Oct 28 '11 at 21:51