v4.0.0-m3

This is the third milestone release of Lean 4, and the last planned milestone before an official release. With almost 3000 commits improving and extending many parts of the system since the last milestone, we are now close to completing all main features we have envisioned for Lean 4.

Contributors:

$ git shortlog -s -n v4.0.0-m2..v4.0.0-m3
  1719  Leonardo de Moura
   725  Sebastian Ullrich
   149  Wojciech Nawrocki
    93  Daniel Selsam
    82  Gabriel Ebner
    36  Joscha
    35  Daniel Fabian
    21  tydeu
    14  Mario Carneiro
    13  larsk21
    12  Jannis Limperg
    11  Chris Lovett
     8  Henrik Böving
     4  François G. Dorais
     4  Siddharth
     3  Joe Hendrix
     3  Scott Morrison
     3  ammkrn
     2  Josh Levine
     2  Mac
     2  Mac Malone
     2  Simon Hudon
     2  pcpthm
     1  Anders Christiansen Sørby
     1  Andrei Cheremskoy
     1  Arthur Paulino
     1  Christian Pehle
     1  Formally Verified Waffle Maker
     1  Hunter Monroe
     1  Jan Hrcek
     1  Joshua Seaton
     1  Kevin Buzzard
     1  Lorenz Leutgeb
     1  Mauricio Collares
     1  Michael Burge
     1  Paul Brinkmeier
     1  Reijo Jaakkola
     1  Severen Redwood
     1  Siddharth Bhat
     1  Tom Ball
     1  Varun Gandhi
     1  WojciechKarpiel
     1  Xavier Noria
     1  gabriel-doriath-dohler
     1  zygi
     1  Бакиновский Максим

v4.0.0-m2

This is the second milestone release of Lean 4. With too many improvements and bug fixes in almost all parts of the system to list, we would like to single out major improvements to simp and other built-in tactics as well as support for a goal view that make the proving experience more comfortable.

v4.0.0-m1

The Lean development team is proud to announce the first milestone release of Lean 4. This release is aimed at experimentation with the new features of Lean 4, eventually leading to a full release of 4.0.0 ready for general use.

This release is the result of almost three years of work since the release of Lean 3.4.0, reworking, extending, and improving almost all aspects of Lean. More information about Lean 4 can be found in the official documentation as well as in the introductory talk "An overview of Lean 4" at Lean Together 2021.

Leonardo de Moura & Sebastian Ullrich

Acknowledgements

Daniel Selsam - type class resolution, feedback, design discussions
Marc Huisinga and Wojciech Nawrocki - Lean Server
Joe Hendrix, Andrew Kent, Rob Dockins, Simon Winwood (Galois Inc) - early adopters, suggestions, feedback
Daan Leijen, Simon Peyton Jones, Nikhil Swamy, Sebastian Graf, Max Wagner - design discussions, feedback, suggestions