You're reading the public-facing archive of the Category Theory Zulip server.
To join the server you need an invite. Anybody can get an invite by contacting Matteo Capucci at name dot surname at gmail dot com.
For all things related to this archive refer to the same person.
Nathanael Arkor (May 09 2022 at 20:37):Hi @everyone. Zulip has recently added support for "web-public streams", which means certain streams can be viewed online for users without an account (though people cannot post anonymously). We're going to be making some of the streams web-public to make the Category Theory Zulip more accessible. However, we will not be making public any of the streams that are not currently archived, nor will any private streams become viewable. You can tell which streams are web-public because they will have a globe icon instead of the usual hash symbol. image.png
Nathanael Arkor (May 09 2022 at 20:43):If you want to share a link to a web-public stream with someone who may not be in the Zulip server, you can right-click on the stream and select "Copy Link", e.g. https://categorytheory.zulipchat.com/#narrow/stream/266967-general.3A-mathematics
Nathanael Arkor (May 09 2022 at 20:44):You can also click the three dots on the right of a message to copy a direct link to that message, which will be viewable if it's in a web-public stream.
John Baez (May 09 2022 at 21:07):Thanks, @Nathanael Arkor!