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Iran TST 2015 Polynomial

Source: Iran TST 2015,third exam,second day,problem 5

June 1, 2015
polynomialalgebra

Problem Statement

Prove that for each natural number dd, There is a monic and unique polynomial of degree dd like PP such that P(1)P(1)00 and for each sequence like a1a_{1},a2a_{2}, ...... of real numbers that the recurrence relation below is true for them, there is a natural number kk such that 0=ak=ak+1=...0=a_{k}=a_{k+1}= ... : P(n)a1+P(n1)a2+...+P(1)an=0P(n)a_{1} + P(n-1)a_{2} + ... + P(1)a_{n}=0 n>1n>1