The special set
Source: Bangladesh Mathematical Olympiad 2020 Problem 9
February 19, 2022
set theoryalgebra
Problem Statement
Bristy wants to build a special set . She starts with . At any step, she can add an integer to the set if it is a root of a polynomial which uses the already existing integers in as coefficients. She keeps doing this, adding more and more numbers to . After she eventually runs out of numbers to add to , how many numbers will be in ?