https://wiki.nixos.org/w/index.php?action=history&feed=atom&title=Lean_4
Lean 4 - Revision history
2026-10-13T07:13:36Z
Revision history for this page on the wiki
MediaWiki 1.46.0
https://wiki.nixos.org/w/index.php?title=Lean_4&diff=34656&oldid=prev
Ghb: Added heading for references
2026-09-14T10:03:19Z
<p>Added heading for references</p>
<table style="background-color: #fff; color: #202122;" data-mw-interface="">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:03, 14 September 2026</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l42">Line 42:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Lean4-mode - major mode for Emacs ===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Lean4-mode - major mode for Emacs ===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[https://github.com/leanprover-community leanprover-community] provides a lean major mode for emacs called [https://github.com/leanprover-community/lean4-mode "lean4-mode"]. However, the provided major mode seems to not be receiving updates, and according to community discussions, it has split up into a number of different forks, with different features and support<ref>"lean4-mode - commits", lean4-mode contributors, https://github.com/leanprover-community/lean4-mode/commits/master/ (Fetched 2026-09-14)</ref><ref>Emacs mode discussions, https://leanprover.zulipchat.com/#narrow/channel/468104-Emacs/topic/Meta/near/580208083 (Fetched 2026-09-14)</ref>. While the version provided by leanprover-community supports [https://github.com/emacs-lsp/lsp-mode lsp-mode], the fork by GitHub user [https://github.com/bustercopley bustercopley] supports [https://github.com/joaotavora/eglot eglot] instead<ref>"Use Eglot isntead of lsp-mode", bustercopley, https://github.com/leanprover-community/lean4-mode/commit/b08114632a756e9e2a5b59b89c2b0d79bd6dae6c (Fetched 2026-09-14)</ref>.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[https://github.com/leanprover-community leanprover-community] provides a lean major mode for emacs called [https://github.com/leanprover-community/lean4-mode "lean4-mode"]. However, the provided major mode seems to not be receiving updates, and according to community discussions, it has split up into a number of different forks, with different features and support<ref>"lean4-mode - commits", lean4-mode contributors, https://github.com/leanprover-community/lean4-mode/commits/master/ (Fetched 2026-09-14)</ref><ref>Emacs mode discussions, https://leanprover.zulipchat.com/#narrow/channel/468104-Emacs/topic/Meta/near/580208083 (Fetched 2026-09-14)</ref>. While the version provided by leanprover-community supports [https://github.com/emacs-lsp/lsp-mode lsp-mode], the fork by GitHub user [https://github.com/bustercopley bustercopley] supports [https://github.com/joaotavora/eglot eglot] instead<ref>"Use Eglot isntead of lsp-mode", bustercopley, https://github.com/leanprover-community/lean4-mode/commit/b08114632a756e9e2a5b59b89c2b0d79bd6dae6c (Fetched 2026-09-14)</ref>.</div></td></tr>
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Ghb
https://wiki.nixos.org/w/index.php?title=Lean_4&diff=34655&oldid=prev
Ghb: Updates to introduction, installation and text editors.
2026-09-14T10:02:03Z
<p>Updates to introduction, installation and text editors.</p>
<table style="background-color: #fff; color: #202122;" data-mw-interface="">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:02, 14 September 2026</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[https://lean-lang.org/ Lean 4] is a pure functional programming language and an interactive theorem prover base on dependent type theory<ref>"The Lean Language Reference", leanprover contributors, https://lean-lang.org/doc/reference/latest/ (Fetched 2026-09-14)</ref>.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Building Lean 4 projects ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Building Lean 4 projects ==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Use the following<syntaxhighlight lang="nix" line="1"></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Use the following<syntaxhighlight lang="nix" line="1"></div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></syntaxhighlight></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></syntaxhighlight></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== Installing Lean 4 ==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Lean4 is available as a package, both on the packages [https://search.nixos.org/packages?channel=26.05&query=lean4#show=lean4 26.05 channel] and the [https://search.nixos.org/packages?channel=unstable&query=lean4#show=lean4 unstable channel], and they may be installed according to their provided instructions. Below is an example of a minimal Lean 4 flake.<syntaxhighlight lang="nix" line="1"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">{</ins></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> inputs = {</ins></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> };</ins></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> outputs = { self, nixpkgs }@inputs:</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> let</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> system = "x86_64-linux";</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> pkgs = nixpkgs.legacyPackages.${system};</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> in</ins></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> devShells.${system}.default = pkgs.mkShell {</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> packages = with pkgs; [</ins></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></syntaxhighlight></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== Text Editors ==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Lean provides an official extension for [https://github.com/leanprover/vscode-lean4 VS Code], but community extensions can also be found for other editors such as [https://github.com/leanprover-community/lean4-mode emacs], [https://github.com/Julian/lean.nvim neovim], cursor and so on. Please note, that Lean FRO recommends installing Lean through the officially supported VS Code extension<ref>"Install Lean", Lean FRO, https://lean-lang.org/install/ (Fetched 2026-09-14)</ref>.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">=== Lean4-mode - major mode for Emacs ===</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[https://github.com/leanprover-community leanprover-community] provides a lean major mode for emacs called [https://github.com/leanprover-community/lean4-mode "lean4-mode"]. However, the provided major mode seems to not be receiving updates, and according to community discussions, it has split up into a number of different forks, with different features and support<ref>"lean4-mode - commits", lean4-mode contributors, https://github.com/leanprover-community/lean4-mode/commits/master/ (Fetched 2026-09-14)</ref><ref>Emacs mode discussions, https://leanprover.zulipchat.com/#narrow/channel/468104-Emacs/topic/Meta/near/580208083 (Fetched 2026-09-14)</ref>. While the version provided by leanprover-community supports [https://github.com/emacs-lsp/lsp-mode lsp-mode], the fork by GitHub user [https://github.com/bustercopley bustercopley] supports [https://github.com/joaotavora/eglot eglot] instead<ref>"Use Eglot isntead of lsp-mode", bustercopley, https://github.com/leanprover-community/lean4-mode/commit/b08114632a756e9e2a5b59b89c2b0d79bd6dae6c (Fetched 2026-09-14)</ref>.</ins></div></td></tr>
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Ghb
https://wiki.nixos.org/w/index.php?title=Lean_4&diff=33922&oldid=prev
Jthulhu: Jthulhu moved page Lean4 to Lean 4: Misspelled title
2026-07-25T08:15:27Z
<p>Jthulhu moved page <a href="/wiki/Lean4" class="mw-redirect" title="Lean4">Lean4</a> to <a href="/wiki/Lean_4" title="Lean 4">Lean 4</a>: Misspelled title</p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 08:15, 25 July 2026</td>
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Jthulhu
https://wiki.nixos.org/w/index.php?title=Lean_4&diff=33921&oldid=prev
Jthulhu: Added basic Lean4 page.
2026-07-25T08:14:45Z
<p>Added basic Lean4 page.</p>
<p><b>New page</b></p><div>== Building Lean 4 projects ==<br />
Use the following<syntaxhighlight lang="nix" line="1"><br />
leanPackages.buildLakePackage {<br />
pname = "my-project";<br />
version = "0.1.0";<br />
src = ./.;<br />
leanDeps = with leanPackages; [ mathlib ];<br />
lakeHash = null; # all deps nix-managed; set to lib.fakeHash for Lake-managed deps<br />
}<br />
<br />
</syntaxhighlight></div>
Jthulhu