Geodesic
Forms of the rings R[X] and R[X, Y]
Glasgow mathematical journal, Tome 13 (1972) no. 2, pp. 91-97

Voir la notice de l'article provenant de la source Cambridge University Press

Let R be a ring and let S = Spec R. Let us consider the étale fini topology on S [5]. By a form of a given S-scheme T we mean any affine S-scheme W that is locally (in the étale fini topology) isomorphic to T. We shall consider forms of the R-schemes T = Spec R[X] and T = Spec R[X, Y]. 
Bryński, M. Forms of the rings R[X] and R[X, Y]. Glasgow mathematical journal, Tome 13 (1972) no. 2, pp. 91-97. doi: 10.1017/S0017089500001464
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