Break books into separate Lean projects.

.gitignore

@@ -1,4 +1,5 @@
-/build
-/lake-packages/*
-/_target
-/leanpkg.path
+# Lean
+**/build
+**/lake-packages/*
+**/_target
+**/leanpkg.path

Bookshelf.lean

@@ -1,2 +0,0 @@
-import Bookshelf.Sequence.Arithmetic
-import Bookshelf.Sequence.Geometric

bookshelf/theorem-proving-in-lean/TheoremProvingInLean.lean

@@ -0,0 +1,6 @@
+import TheoremProvingInLean.Exercises2
+import TheoremProvingInLean.Exercises3
+import TheoremProvingInLean.Exercises4
+import TheoremProvingInLean.Exercises5
+import TheoremProvingInLean.Exercises7
+import TheoremProvingInLean.Exercises8

bookshelf/theorem-proving-in-lean/lake-manifest.json

@@ -0,0 +1 @@
+{"version": 4, "packagesDir": "lake-packages", "packages": []}

bookshelf/theorem-proving-in-lean/lakefile.lean

@@ -0,0 +1,7 @@
+import Lake
+open Lake DSL
+
+package «theorem-proving-in-lean»
+
+@[default_target]
+lean_lib «TheoremProvingInLean»

common/Sequence.lean

@@ -0,0 +1,2 @@
+import Sequence.Arithmetic
+import Sequence.Geometric

common/lake-manifest.json

@@ -4,7 +4,7 @@
  [{"git":
    {"url": "https://github.com/leanprover-community/mathlib4.git",
     "subDir?": null,
-    "rev": "065e9956724008d1059577700fd676eaf25f35d5",
+    "rev": "7e974fd3806866272e9f6d9e44fa04c210a21f87",
     "name": "mathlib",
     "inputRev?": null}},
   {"git":

common/lakefile.lean

@@ -0,0 +1,12 @@
+import Lake
+open Lake DSL
+
+require mathlib from git
+  "https://github.com/leanprover-community/mathlib4.git"
+
+package «Common»
+
+@[default_target]
+lean_lib «Common» {
+  roots := #["Sequence"]
+}

common/lean-toolchain

@@ -0,0 +1 @@
+leanprover/lean4:nightly-2023-02-10

lakefile.lean

@@ -1,14 +0,0 @@
-import Lake
-open Lake DSL
-
-require mathlib from git
-  "https://github.com/leanprover-community/mathlib4.git"
-
-package «bookshelf» {
-  -- add package configuration options here
-}
-
-@[default_target]
-lean_lib «Bookshelf» {
-  -- add library configuration options here
-}