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Classifying spaces for étale algebras with generators
Canadian Journal of Mathematics - Journal Canadien de Mathematiques
We construct varieties B(r; A n ) such that a map X → B(r; A n ) corresponds to a degree-nétale algebra on X equipped with r generating global sections. We then show that when n = 2, i.e., in the quadraticétale case, that the singular cohomology of B(r; A n )(R) can be used to reconstruct a famous example of S. Chase and to extend its application to showing that there is a smooth affine r − 1-dimensional R-variety on which there areétale algebras An of arbitrary degrees n that cannot bedoi:10.4153/s0008414x20000206 fatcat:ut5lsvlp7rfvfenmtucjxpfwfm