Not signed in (Sign In)

# Start a new discussion

## Not signed in

Want to take part in these discussions? Sign in if you have an account, or apply for one below

• Sign in using OpenID

## Site Tag Cloud

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

1. I added a sentence to fundamental group which contains a link to an example for a fundamental group of an affine scheme.
• CommentRowNumber2.
• CommentAuthorTim_Porter
• CommentTimeAug 26th 2012
• (edited Aug 26th 2012)

I have added a bit more plus some links. This required writing a stub on pro-spaces as this was lacking and was needed in several other entries.

• CommentRowNumber3.
• CommentAuthorUrs
• CommentTimeSep 3rd 2012

I have expanded fundamental group: filled in all the little details that were omitted previously in a list of Definitions/Remarks/Propositions. But only up to and ex-cluding the section “Generalizations”. (This section needs to be connected with étale homotopy, eventually.)

• CommentRowNumber4.
• CommentAuthorUrs
• CommentTimeSep 3rd 2012

Also added a comment pointing to the relation to first singular homology and then started an Examples-section.

• CommentRowNumber5.
• CommentAuthorTim_Porter
• CommentTimeSep 3rd 2012
• (edited Sep 3rd 2012)

I have added stuff to algebraic fundamental group adapted from some notes of Tomás Szamuely, which I have given as reference. The entry is still stubby and I need to work out several points that are obscure (like what is $\Omega$, but thought it better to get something down rather than to leave the entry very empty (I had promised myself 18 months ago to do something about this subject … better late than never. :-)) I also started a web page on Szamuely but this is just a link to his homepage (He looks to have some good sets of notes and other interesting stuff.)

• CommentRowNumber6.
• CommentAuthorTim_Porter
• CommentTimeSep 3rd 2012

I started a page on what Borceux and Janelidze call the Chevalley fundamental group. This is the algebraic / Grothendieck approach to the usual fundamental group, at least on spaces having a universal covering. They gave Chevalley’s book on Lie groups as the source.

• CommentRowNumber7.
• CommentAuthorUrs
• CommentTimeSep 3rd 2012

Thanks, Tim. Maybe it would be better to post these announcements in the other thread, though.

• CommentRowNumber8.
• CommentAuthorTim_Porter
• CommentTimeSep 3rd 2012

Have done.

Add your comments
• Please log in or leave your comment as a "guest post". If commenting as a "guest", please include your name in the message as a courtesy. Note: only certain categories allow guest posts.
• To produce a hyperlink to an nLab entry, simply put double square brackets around its name, e.g. [[category]]. To use (La)TeX mathematics in your post, make sure Markdown+Itex is selected below and put your mathematics between dollar signs as usual. Only a subset of the usual TeX math commands are accepted: see here for a list.

• (Help)