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$\mathbb{Z} R$ and rings of Witt vectors $W_S (R)$ (1803.00812v1)
Published 2 Mar 2018 in math.AC
Abstract: Using $\lambda$ operations, we give some results on the kernel of the natural map from the monoid algebra $\mathbb{Z} R$ of a commutative ring $R$ to the ring of $S$-Witt vectors of $R$. As a byproduct we obtain a very natural interpretation of a power series used by Dwork in his proof of the rationality of zeta functions for varieties over finite fields.
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