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beautiful algebra problem

Source: Iranian RMM TST 2021 Day2 P3

April 16, 2021
algebrapolynomial

Problem Statement

We call a polynomial P(x)=adxd+...+a0P(x)=a_dx^d+...+a_0 of degree dd nice if 2021(ad+...+a0)2022<max0idai\frac{2021(|a_d|+...+|a_0|)}{2022}<max_{0 \le i \le d}|a_i| Initially Shayan has a sequence of dd distinct real numbers; r1,...,rd±1r_1,...,r_d \neq \pm 1. At each step he choose a positive integer N>1N>1 and raises the dd numbers he has to the exponent of NN, then delete the previous dd numbers and constructs a monic polynomial of degree dd with these number as roots, then examine whether it is nice or not. Prove that after some steps, all the polynomials that shayan produces would be nice polynomials
Proposed by Navid Safaei