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1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeMay 19th 2019
   • (edited May 19th 2019)
   • PermaLink
   Author: Urs
   Format: MarkdownItexbrief `category:people`-entry for hyperlinking references at _[[orbifold]]_ and _[[hyperbolic manifold]]_, in particular to this excellent book: * [[John Ratcliffe]], _Foundations of Hyperbolic Manifolds_, Springer 2006 ([doi:10.1007/978-0-387-47322-2](https://link.springer.com/book/10.1007/978-0-387-47322-2), <a href="http://entsphere.com/pub/pdf/Ratcliffe%20-%20Foundations%20of%20hyperbolic%20manifolds%20(2e)%20-%20GTM%20149.pdf">pdf</a>) <a href="https://ncatlab.org/nlab/revision/John+Ratcliffe/1">v1</a>, <a href="https://ncatlab.org/nlab/show/John+Ratcliffe">current</a>

   brief category:people-entry for hyperlinking references at orbifold and hyperbolic manifold, in particular to this excellent book:

   • John Ratcliffe, Foundations of Hyperbolic Manifolds, Springer 2006 (doi:10.1007/978-0-387-47322-2, pdf)

   v1, current

2. • CommentRowNumber2.
   • CommentAuthorTim_Porter
   • CommentTimeMay 19th 2019
   • (edited May 19th 2019)
   • PermaLink
   Author: Tim_Porter
   Format: MarkdownItexThe link to Vanderbilt uni goes nowhere as the apparent links on that further page lead to messages saying it has been archived or suspended. I was wondering if this John Ratcliffe was the same at the author of Ratcliffe's lemma from Combinatorial Group Theory. It looks likely as his thesis was on: The Theory of Crossed Modules with Applications to Cohomology of Groups and Combinatorial Homotopy theory

   The link to Vanderbilt uni goes nowhere as the apparent links on that further page lead to messages saying it has been archived or suspended.

   I was wondering if this John Ratcliffe was the same at the author of Ratcliffe’s lemma from Combinatorial Group Theory. It looks likely as his thesis was on: The Theory of Crossed Modules with Applications to Cohomology of Groups and Combinatorial Homotopy theory

3. • CommentRowNumber3.
   • CommentAuthorUrs
   • CommentTimeMay 19th 2019
   • PermaLink
   Author: Urs
   Format: MarkdownItexThe link in the entry [https://as.vanderbilt.edu/math/bio/?who=john-ratcliffe](https://as.vanderbilt.edu/math/bio/?who=john-ratcliffe) works fine for me.

   The link in the entry

   https://as.vanderbilt.edu/math/bio/?who=john-ratcliffe

   works fine for me.

4. • CommentRowNumber4.
   • CommentAuthorTim_Porter
   • CommentTimeMay 19th 2019
   • PermaLink
   Author: Tim_Porter
   Format: MarkdownItexWhen you follow that link the page has a link: >Click here for a complete list of Research Articles, Books and Book Reviews. That leads nowhere. There seems nothing one can do as I tried other routes to see if I could get to the corresponding page. It gives: >This site has been archived or suspended. I also tried https://my.vanderbilt.edu/johnratcliffe/ with the same effect. It is not important but I thought I would mention it in case someone could find how to display his publication list, which might be useful.

   When you follow that link the page has a link:

   Click here for a complete list of Research Articles, Books and Book Reviews.

   That leads nowhere. There seems nothing one can do as I tried other routes to see if I could get to the corresponding page. It gives:

   This site has been archived or suspended.

   I also tried https://my.vanderbilt.edu/johnratcliffe/ with the same effect.

   It is not important but I thought I would mention it in case someone could find how to display his publication list, which might be useful.

5. • CommentRowNumber5.
   • CommentAuthorDavidRoberts
   • CommentTimeMay 19th 2019
   • (edited May 19th 2019)
   • PermaLink
   Author: DavidRoberts
   Format: MarkdownItex@Tim It's the same guy. MathSciNet lists only one John Ratcliffe ([papers](https://mathscinet.ams.org/mathscinet/search/publications.html?pg1=INDI&s1=145190&sort=Newest&vfpref=html&r=1&extend=1), subscription needed), and the thesis is as you claim, up to his most recent paper in 2017, _A Bieberbach theorem for crystallographic group extensions_.

   @Tim

   It’s the same guy. MathSciNet lists only one John Ratcliffe (papers, subscription needed), and the thesis is as you claim, up to his most recent paper in 2017, A Bieberbach theorem for crystallographic group extensions.