Let be any unital associative, possibly non-commutative ring and let be a prime number. Let be the ring of -typical Witt vectors as constructed by Cuntz and Deninger and be the abelian group constructed by Hesselholt. In arXiv:1708.04065 it was proved that if and is non commutative unital torsion free ring then there is no surjective continuous group homomorphism from which commutes with the Verschiebung operator and the Teichm"uller map. In this paper we generalise this result to all primes and simplify the arguments used for . We also prove that if a is non-commutative unital ring then there is no continuous map of sets which commutes with the ghost maps.

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