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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeJun 16th 2020
• (edited Jun 16th 2020)

am starting this with a minimum of an Idea-section, for the moment just so as to give a home to this reference:

• CommentRowNumber2.
• CommentAuthorDavid_Corfield
• CommentTimeJun 16th 2020
• (edited Jun 16th 2020)

the adjective ‘proper’ indicates that the theory is only sensible to fixed point information for compact subgroups

So this is to retain the advantages of compactness outlined by Charles Rezk back here?

Why call it ’proper’?

• CommentRowNumber3.
• CommentAuthorDavidRoberts
• CommentTimeJun 16th 2020

My guess is because it covers proper actions by topological groups, and probably proper Lie groupoids as well, if it’s done right.

• CommentRowNumber4.
• CommentAuthorUrs
• CommentTimeJun 16th 2020

Yes.

• CommentRowNumber5.
• CommentAuthorUrs
• CommentTimeJun 16th 2020

(By the way, that quote in #2 is from their article, not my $n$Lab article. Otherwise I would go and fix the “is sensible to” to “is sensitive to”.

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