mathlib4

Work in progress mathlib port for Lean 4. This is not a port. We are just trying things out to gain experience for the real port.

We're not planning to have any review standards in the mathlib4 repo higher than your average wiki during this experimentation phase.

We don't want to discourage others from trying to port stuff if it helps us learn how to work in lean 4, but please understand that anything that is currently in mathlib4 is subject to change/deletion, and the "real" port hasn't started yet

Build instructions

• Make sure Lean is not running, and close all instances of VSCode running Lean processes.
• Get the newest version of elan. If you already have installed a version of Lean, you can run

  elan self update
  

  If the above command fails, or if you need to install elan, run

  curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf | sh
  

  If this also fails, follow the instructions under Regular install here.
• To build mathlib4 run lake build. To build and run all tests, run make.
• If you added a new file, run the following command to update Mathlib.lean

  find Mathlib -name "*.lean" | env LC_ALL=C sort | sed 's/\.lean//;s,/,.,g;s/^/import /' > Mathlib.lean
  

Building HTML documentation

Building HTML documentation locally is straightforward:

lake -Kdoc=on build Mathlib:docs

The HTML files can then be found in build/doc.

Dependencies

If you want to update dependencies, use lake update -Kdoc=on. This will update the lean_packages/manifest.json file correctly. You will need to make a PR after committing the changes to this file.