Add files

.gitignore

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+/build
+/lake-packages/*

Nevanlinna.lean

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+def hello := "world"

lake-manifest.json

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+{"version": 7,
+ "packagesDir": ".lake/packages",
+ "packages":
+ [{"url": "https://github.com/leanprover/std4",
+   "type": "git",
+   "subDir": null,
+   "rev": "e840c18f7334c751efbd4cfe531476e10c943cdb",
+   "name": "std",
+   "manifestFile": "lake-manifest.json",
+   "inputRev": "main",
+   "inherited": true,
+   "configFile": "lakefile.lean"},
+  {"url": "https://github.com/leanprover-community/quote4",
+   "type": "git",
+   "subDir": null,
+   "rev": "64365c656d5e1bffa127d2a1795f471529ee0178",
+   "name": "Qq",
+   "manifestFile": "lake-manifest.json",
+   "inputRev": "master",
+   "inherited": true,
+   "configFile": "lakefile.lean"},
+  {"url": "https://github.com/leanprover-community/aesop",
+   "type": "git",
+   "subDir": null,
+   "rev": "5fefb40a7c9038a7150e7edd92e43b1b94c49e79",
+   "name": "aesop",
+   "manifestFile": "lake-manifest.json",
+   "inputRev": "master",
+   "inherited": true,
+   "configFile": "lakefile.lean"},
+  {"url": "https://github.com/leanprover-community/ProofWidgets4",
+   "type": "git",
+   "subDir": null,
+   "rev": "fb65c476595a453a9b8ffc4a1cea2db3a89b9cd8",
+   "name": "proofwidgets",
+   "manifestFile": "lake-manifest.json",
+   "inputRev": "v0.0.30",
+   "inherited": true,
+   "configFile": "lakefile.lean"},
+  {"url": "https://github.com/leanprover/lean4-cli",
+   "type": "git",
+   "subDir": null,
+   "rev": "be8fa79a28b8b6897dce0713ef50e89c4a0f6ef5",
+   "name": "Cli",
+   "manifestFile": "lake-manifest.json",
+   "inputRev": "main",
+   "inherited": true,
+   "configFile": "lakefile.lean"},
+  {"url": "https://github.com/leanprover-community/import-graph.git",
+   "type": "git",
+   "subDir": null,
+   "rev": "61a79185b6582573d23bf7e17f2137cd49e7e662",
+   "name": "importGraph",
+   "manifestFile": "lake-manifest.json",
+   "inputRev": "main",
+   "inherited": true,
+   "configFile": "lakefile.lean"},
+  {"url": "https://github.com/leanprover-community/mathlib4.git",
+   "type": "git",
+   "subDir": null,
+   "rev": "e408da18380ef42acf7b8337c6b0536bfac09105",
+   "name": "mathlib",
+   "manifestFile": "lake-manifest.json",
+   "inputRev": null,
+   "inherited": false,
+   "configFile": "lakefile.lean"}],
+ "name": "nevanlinna",
+ "lakeDir": ".lake"}

lakefile.lean

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+import Lake
+open Lake DSL
+
+package «nevanlinna» {
+  -- add any package configuration options here
+}
+
+require mathlib from git
+  "https://github.com/leanprover-community/mathlib4.git"
+
+@[default_target]
+lean_lib «Nevanlinna» {
+  -- add any library configuration options here
+}

lean-toolchain

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+leanprover/lean4:v4.7.0

nevanlinna/test.lean

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+