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Hausdorff completion : ウィキペディア英語版 | Hausdorff completion
In algebra, the Hausdorff completion of a group ''G'' with filtration is the inverse limit of the discrete group . A basic example is a profinite completion. The image of the canonical map is a Hausdorff topological group and its kernel is the intersection of all : i.e., the closure of the identity element. The canonical homomorphism is an isomorphism, where is a graded module associated to the filtration. The concept is named after Felix Hausdorff. == References ==
*Nicolas Bourbaki, ''Commutative algebra''
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