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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.

• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeNov 6th 2020

• CommentRowNumber2.
• CommentAuthorUrs
• CommentTimeSep 2nd 2021

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.

• CommentRowNumber3.
• CommentAuthorUrs
• CommentTimeSep 4th 2021

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