Une algèbre d’homomorphismes d’anneaux localisés affines d’une variété algébrique est continue par rapport à la topologie de Krull. Elle peut être ni ouverte ni fermée. Cependant, on montre que l’image induite sur l’anneau local analytique associé est également ouverte et fermée par rapport à la topologie de Krull. Afin de démontrer ceci, on prouve la conjecture suivante de Tougeron : si est une courbe analytique sur un ensemble analytique et si est une série formelle de puissances dont la restriction à toute courbe sur dans un voisinage de (topologie de Krull) est convergente, alors la restriction de à est convergente.
An algebra homomorphism of the locatized affine rings of an algebraic variety is continuous in the Krull topology of the respective local rings. It is not necessarily open or closed in the Krull topology. However, we show that the induced map on the associated analytic local rings is also open and closed in the Krull topology. To do this we prove a conjecture of Tougeron which states that if is an analytic curve on an analytic variety and is a formal power series which is convergent when restricted to all curves on near (in the Krull topology), then is convergent when restricted to .
@article{AIF_1977__27_4_9_0, author = {Becker, Joseph}, title = {Expos\'e on a conjecture of {Tougeron}}, journal = {Annales de l'Institut Fourier}, pages = {9--27}, publisher = {Imprimerie Durand}, address = {Chartres}, volume = {27}, number = {4}, year = {1977}, doi = {10.5802/aif.670}, mrnumber = {58 #10904}, zbl = {0337.14002}, language = {en}, url = {http://www.numdam.org/articles/10.5802/aif.670/} }
Becker, Joseph. Exposé on a conjecture of Tougeron. Annales de l'Institut Fourier, Tome 27 (1977) no. 4, pp. 9-27. doi : 10.5802/aif.670. http://www.numdam.org/articles/10.5802/aif.670/
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