Revert to nesting author names.

These modules group together chapter/exercise specific proofs vs.
concepts that permeate said chapters.

FirstCourseAbstractAlgebra.lean

@@ -1 +1 @@
-import FirstCourseAbstractAlgebra.Chapter1
+import FirstCourseAbstractAlgebra.Fraleigh

FirstCourseAbstractAlgebra/Fraleigh.lean

@@ -0,0 +1 @@
+import FirstCourseAbstractAlgebra.Fraleigh.Chapter1

MathematicalIntroductionLogic.lean

@@ -1,2 +1,2 @@
-import MathematicalIntroductionLogic.Chapter0
+import MathematicalIntroductionLogic.Enderton
 import MathematicalIntroductionLogic.Tuple

MathematicalIntroductionLogic/Enderton.lean

@@ -0,0 +1 @@
+import MathematicalIntroductionLogic.Enderton.Chapter0

OneVariableCalculus.lean

@@ -1,3 +1,2 @@
-import OneVariableCalculus.Chapters
-import OneVariableCalculus.Exercises
+import OneVariableCalculus.Apostol
 import OneVariableCalculus.Real

OneVariableCalculus/Apostol.lean

@@ -0,0 +1,3 @@
+import OneVariableCalculus.Apostol.Chapter_I_3
+import OneVariableCalculus.Apostol.Exercises_1_7
+import OneVariableCalculus.Apostol.Exercises_I_3_12

OneVariableCalculus/Apostol/Exercises_I_3_12.lean

@@ -10,7 +10,7 @@ import Mathlib.Data.Real.Sqrt
 import Mathlib.Tactic.LibrarySearch
 
 import Bookshelf.Real.Rational
-import OneVariableCalculus.Chapters.Chapter_I_3
+import OneVariableCalculus.Apostol.Chapter_I_3
 
 -- ========================================
 -- Exercise 1

OneVariableCalculus/Chapters.lean

@@ -1 +0,0 @@
-import OneVariableCalculus.Chapters.Chapter_I_3

OneVariableCalculus/Exercises.lean

@@ -1,2 +0,0 @@
-import OneVariableCalculus.Exercises.Exercises_I_3_12
-import OneVariableCalculus.Exercises.Exercises_1_7

TheoremProvingInLean.lean

@@ -1,6 +1 @@
-import TheoremProvingInLean.Chapter2
-import TheoremProvingInLean.Chapter3
-import TheoremProvingInLean.Chapter4
-import TheoremProvingInLean.Chapter5
-import TheoremProvingInLean.Chapter7
-import TheoremProvingInLean.Chapter8
+import TheoremProvingInLean.Avigad

TheoremProvingInLean/Avigad.lean

@@ -0,0 +1,6 @@
+import TheoremProvingInLean.Avigad.Chapter2
+import TheoremProvingInLean.Avigad.Chapter3
+import TheoremProvingInLean.Avigad.Chapter4
+import TheoremProvingInLean.Avigad.Chapter5
+import TheoremProvingInLean.Avigad.Chapter7
+import TheoremProvingInLean.Avigad.Chapter8