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Polynomial in Z as a sum of cubes

Source: Polish math olympiad 1996 second round

July 11, 2019
algebrapolynomialfactorizationsum of cubes

Problem Statement

Can every polynomial with integer coefficients be expressed as a sum of cubes of polynomials with integer coefficients?
I found the following statement that can be linked to this problem: "It is easy to see that every polynomial in F[x] is sum of cubes if char (F)\ne3 and card (F)=2,4"