n is periodic with the smallest period 1995
Source: Vietnam TST 1995, Problem 6
July 27, 2008
functionalgebra unsolvedalgebra
Problem Statement
Consider the function f(x) \equal{} \frac {2x^3 \minus{} 3}{3x^2 \minus{} 1}.
Prove that there is a continuous function on satisfying f(g(x)) \equal{} x and for all real .
Show that there exists a real number such that the sequence , n \equal{} 1, 2, \ldots, defined as follows a_0 \equal{} a, a_{n \plus{} 1} \equal{} f(a_n), is periodic with the smallest period .