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diff --git a/flake.nix b/flake.nix
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+{
+  description = "Symbolic Modal Logic in Lean4";
+  inputs = {
+    nixpkgs = {
+      url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    };
+    flake-utils = {
+      url = "github:numtide/flake-utils";
+    };
+  };
+  outputs = { self, nixpkgs, flake-utils }: flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs { inherit system; };
+      lean-shell = pkgs.mkShell {
+        name = "Lean";
+        packages = [ pkgs.lean4 ];
+      };
+    in {
+    devShells = {
+      default = lean-shell;
+      lean = lean-shell;
+    };
+  });
+}