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1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeNov 6th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexhave cross-linked with _[[commutant]]_ <a href="https://ncatlab.org/nlab/revision/diff/centralizer/6">diff</a>, <a href="https://ncatlab.org/nlab/revision/centralizer/6">v6</a>, <a href="https://ncatlab.org/nlab/show/centralizer">current</a>

   have cross-linked with commutant

   diff, v6, current

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeSep 2nd 2021
   • PermaLink
   Author: Urs
   Format: MarkdownItexthere was an issue both in the wording ("all elements which commute with $S$" was at best ambiguous) and in notation (the subset notation changed from $S$ to $H$, without notice). I have fixed this and, while I was at it, beautified the whole thing. <a href="https://ncatlab.org/nlab/revision/diff/centralizer/8">diff</a>, <a href="https://ncatlab.org/nlab/revision/centralizer/8">v8</a>, <a href="https://ncatlab.org/nlab/show/centralizer">current</a>

   there was an issue both in the wording (“all elements which commute with $S$” was at best ambiguous) and in notation (the subset notation changed from $S$ to $H$, without notice).

   I have fixed this and, while I was at it, beautified the whole thing.

   diff, v8, current

3. • CommentRowNumber3.
   • CommentAuthorUrs
   • CommentTimeSep 4th 2021
   • PermaLink
   Author: Urs
   Format: MarkdownItexAdded a remark ([here](https://ncatlab.org/nlab/show/centralizer#CentralizersInT1GroupsAreClosed)) that centralizers in $T_1$-groups are closed. <a href="https://ncatlab.org/nlab/revision/diff/centralizer/9">diff</a>, <a href="https://ncatlab.org/nlab/revision/centralizer/9">v9</a>, <a href="https://ncatlab.org/nlab/show/centralizer">current</a>

   Added a remark (here) that centralizers in $T_1$-groups are closed.

   diff, v9, current