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p(x-1)p(x+1)= p(x^2-1) polynomial

Source: Austrian Polish 2003 APMC

April 25, 2020
polynomialfunctionalalgebrafunctional equation

Problem Statement

Find all real polynomials p(x)p(x) such that p(x1)p(x+1)=p(x21)p(x-1)p(x+1)= p(x^2-1).