Abstract
We prove that the functor ring-of-rational-Witt-vectors W 0(−) becomes co-representable in the category of noncommutative motives. As an application, we obtain an immediate extension of W 0(−) from commutative rings to schemes. Then, making use of the theory of noncommutative motives, we classify all natural transformations of the functor K-theory-of-automorphisms.
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