Geodesic
P-jets of finite algebras. II: $p$-typical Witt rings
Documenta mathematica, Tome 18 (2013), pp. 971-996

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We study the structure of the p-jet spaces of the p-typical Witt rings of the p-adics. We also study the p-jets of the comonad map. These data can be viewed as an arithmetic analogue, for the ring Z, of the Lie groupoid of the line and hence as an infinitesimal version of the Galois group of Q over “F1​”.
DOI : 10.4171/dm/418
Classification : 05, 13
Mots-clés : Witt vectors 
Alexandru Buium. P-jets of finite algebras. II: $p$-typical Witt rings. Documenta mathematica, Tome 18 (2013), pp. 971-996. doi: 10.4171/dm/418
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     author = {Alexandru Buium},
     title = {P-jets of finite algebras. {II:} $p$-typical {Witt} rings},
     journal = {Documenta mathematica},
     pages = {971--996},
     year = {2013},
     volume = {18},
     doi = {10.4171/dm/418},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/418/}
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