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Results tagged with ac.commutative-algebra
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user 18702
Commutative rings, modules, ideals, homological algebra, computational aspects, invariant theory, connections to algebraic geometry and combinatorics.
5
votes
Witt coordinates vs Joyal coordinates on the ring of Witt vectors
The coordinates $y_n$ correspond to the operations $\delta^n$ (iterates of $\delta$), whereas the coordinates $x_n$ correspond to the operations $\delta_n$, defined by
$$ \phi^n(f) = \sum_{k=0}^n p^k …
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