Geodesic
Artin--Hasse Exponential Mapping, Algebraic Groups in Positive Characteristic, and the Nottingham Group
Matematičeskie zametki, Tome 97 (2015) no. 1, pp. 3-12

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Connected commutative subgroups of the prounipotent radical of the group of formal power series in one variable over an algebraically closed field of positive characteristic with respect to the operation of substitution are studied.
Keywords: Artin–Hasse exponential mapping, group of formal power series, algebraically closed field.
Mots-clés : prounipotent radical 
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     author = {Ya. V. Abramov},
     title = {Artin--Hasse {Exponential} {Mapping,} {Algebraic} {Groups} in {Positive} {Characteristic,} and the {Nottingham} {Group}},
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Ya. V. Abramov. Artin--Hasse Exponential Mapping, Algebraic Groups in Positive Characteristic, and the Nottingham Group. Matematičeskie zametki, Tome 97 (2015) no. 1, pp. 3-12. http://geodesic.mathdoc.fr/item/MZM_2015_97_1_a0/