Timeline for Witt vectors with $p$-torsion
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
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| Jun 17, 2018 at 1:15 | comment | added | KConrad | You could also use $R = \mathbf Z/p^2\mathbf Z$. Here $p^i = 0$ for all $i \geq 2$ and $a = (p,p,p,\ldots)$ is a nonzero element of $W(R)$ with $pa = 0$. | |
| Jun 16, 2018 at 22:19 | review | Close votes | |||
| Jun 17, 2018 at 14:15 | |||||
| Jun 16, 2018 at 22:03 | comment | added | darij grinberg | For example, $R = \mathbb{F}_p\left[x\right] / \left(x^p\right)$. Then, if you realize the Witt vectors $W\left(R\right)$ as power series with constant term $1$ over $R$ (with multiplication of power series as addition), then the Witt vector $1 + tx$ becomes $0$ when multiplied by $p$. | |
| Jun 16, 2018 at 21:45 | history | asked | cll | CC BY-SA 4.0 |