/math

A mini-book on category theory. Superseded by https://github.com/jonsterling/forest

Primary LanguageTeX

Notice: These lecture notes have now been incorporated into my Forest. This repository will not be updated except in order to fix broken redirects.

This repository is based on Krater, a tool for building math-rich websites; the purpose of the present code is to support "Stacks Project"-style websites, where you create a bunch of files like _nodes/00A4.md that may import each other, and then specify a root like _lectures/lecture.md that imports some node.

Running on your machine

You will need a running LaTeX installation, including latexmk, dvisvgm and whatever engine and packages you plan on using. Chances are that if you're reading this you already have everything you need.

You will need to install Ruby 2.7.5; you will need to ensure that you have ghostscript installed, with the LIBGS environment variable correctly set. On macOS with Homebrew, after installing ghostscript you must add the following line to your .bashrc or .zshrc:

export LIBGS=/opt/homebrew/lib/libgs.dylib

After that, you can simply

# install dependencies
bundle
# run Jekyll
bundle exec jekyll serve

and your website will be available at http://127.0.0.1:4000/<REPO_NAME>/.

Node UID policy and drafts

  1. Node UIDs should be added in order; so if the greatest node UID is 00X2, then the next node that is committed should be 00X3.

  2. When a new node 00X3 is committed, it is permanent: it is not permitted to rename it, however it is permitted to delete it.

If two branches contain drafted nodes, when one is merged, the node UIDs chosen on the other branch have to be renamed so that when they are committed to main, there are no conflicts and node UIDs are consecutive. This causes considerable friction, so we will use the following method for drafts.

  1. In a draft, name any new node with an underscore _00X3.

  2. Prior to merging, you may acquire a temporary lock on the entire repository and rename every node draft node to the next consecutive "permanent" UID.

  3. Pull requests that involve draft nodes should be squashed prior to being merged; this is because we want to avoid the auto-generated changelog from referring to draft nodes that do not exist at merge-time.

The script mint-node.rkt will assist you in determining what the next permanent UID is. For now you must handle the renaming manually, but in the future we can include scripts to automate this process.