Formal target: Corpus.Erdos324.erdos_324.variants.quintic
Probably $f(x) = x^5$ has the property that the sums $f(a)+f(b)$ with $a < b$ nonnegative integers are distinct.
Exact formal statement
Set.InjOn.{0, 0}
(fun x =>
Corpus.Erdos324.erdos_324.variants.quintic.match_1.{1} (fun x => Nat) x fun a b =>
HAdd.hAdd.{0, 0, 0} (HPow.hPow.{0, 0, 0} a 5) (HPow.hPow.{0, 0, 0} b 5))
(Set.ofPred.{0} fun x =>
Corpus.Erdos324.erdos_324.variants.quintic.match_1.{1} (fun x => Prop) x fun a b => LT.lt.{0} a b)This target is a formal statement, not a proof of the problem.
Environment availability: available.