I'm searching for a polynomial f of degree 4 with the following property: f and all its derivatives have the maximum number of integer roots.
Concretely formulated:
f(x)=(x−a)(x−b)(x−c)(x−d)f′(x)=4(x−e)(x−f)(x−g)f″
should be satisfied simultaneously with distinct integers a,b,c,d, distinct integers e,f,g, disctinct integers h,i and an integer j.
My conjecture is that there is no such polynomial. For degree 3, there are solutions. Can anyone either prove this or find a counterexample?
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