diff --git a/HepLean.lean b/HepLean.lean
index dcd2d019..b6b3c598 100644
--- a/HepLean.lean
+++ b/HepLean.lean
@@ -121,24 +121,25 @@ import HepLean.Meta.Remark.Basic
 import HepLean.Meta.Remark.Properties
 import HepLean.Meta.TODO.Basic
 import HepLean.Meta.TransverseTactics
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.Basic
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.NormalOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.StaticWickTheorem
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.SuperCommute
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.TimeContraction
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.TimeOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.WicksTheoremNormal
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.Basic
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.Grading
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.NormTimeOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.NormalOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.SuperCommute
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.TimeOrder
 import HepLean.PerturbationTheory.CreateAnnihilate
 import HepLean.PerturbationTheory.FeynmanDiagrams.Basic
 import HepLean.PerturbationTheory.FeynmanDiagrams.Instances.ComplexScalar
 import HepLean.PerturbationTheory.FeynmanDiagrams.Instances.Phi4
 import HepLean.PerturbationTheory.FeynmanDiagrams.Momentum
+import HepLean.PerturbationTheory.FieldOpAlgebra.Basic
+import HepLean.PerturbationTheory.FieldOpAlgebra.NormalOrder
+import HepLean.PerturbationTheory.FieldOpAlgebra.StaticWickTheorem
+import HepLean.PerturbationTheory.FieldOpAlgebra.SuperCommute
+import HepLean.PerturbationTheory.FieldOpAlgebra.TimeContraction
+import HepLean.PerturbationTheory.FieldOpAlgebra.TimeOrder
+import HepLean.PerturbationTheory.FieldOpAlgebra.WicksTheorem
+import HepLean.PerturbationTheory.FieldOpAlgebra.WicksTheoremNormal
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.Basic
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.Grading
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.NormTimeOrder
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.NormalOrder
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.SuperCommute
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.TimeOrder
 import HepLean.PerturbationTheory.FieldSpecification.Basic
 import HepLean.PerturbationTheory.FieldSpecification.CrAnFieldOp
 import HepLean.PerturbationTheory.FieldSpecification.CrAnSection
@@ -170,7 +171,6 @@ import HepLean.PerturbationTheory.WickContraction.TimeCond
 import HepLean.PerturbationTheory.WickContraction.TimeContract
 import HepLean.PerturbationTheory.WickContraction.Uncontracted
 import HepLean.PerturbationTheory.WickContraction.UncontractedList
-import HepLean.PerturbationTheory.WicksTheorem
 import HepLean.SpaceTime.Basic
 import HepLean.SpaceTime.CliffordAlgebra
 import HepLean.StandardModel.Basic
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/Basic.lean b/HepLean/PerturbationTheory/FieldOpAlgebra/Basic.lean
similarity index 99%
rename from HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/Basic.lean
rename to HepLean/PerturbationTheory/FieldOpAlgebra/Basic.lean
index 6c4f2ed3..92ac539c 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/Basic.lean
+++ b/HepLean/PerturbationTheory/FieldOpAlgebra/Basic.lean
@@ -3,7 +3,7 @@ Copyright (c) 2025 Joseph Tooby-Smith. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.SuperCommute
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.SuperCommute
 import Mathlib.Algebra.RingQuot
 import Mathlib.RingTheory.TwoSidedIdeal.Operations
 /-!
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/NormalOrder.lean b/HepLean/PerturbationTheory/FieldOpAlgebra/NormalOrder.lean
similarity index 99%
rename from HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/NormalOrder.lean
rename to HepLean/PerturbationTheory/FieldOpAlgebra/NormalOrder.lean
index 9eda79a8..9b8aab21 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/NormalOrder.lean
+++ b/HepLean/PerturbationTheory/FieldOpAlgebra/NormalOrder.lean
@@ -3,8 +3,8 @@ Copyright (c) 2025 Joseph Tooby-Smith. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.NormalOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.SuperCommute
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.NormalOrder
+import HepLean.PerturbationTheory.FieldOpAlgebra.SuperCommute
 /-!
 
 # Normal Ordering on Field operator algebra
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/StaticWickTheorem.lean b/HepLean/PerturbationTheory/FieldOpAlgebra/StaticWickTheorem.lean
similarity index 98%
rename from HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/StaticWickTheorem.lean
rename to HepLean/PerturbationTheory/FieldOpAlgebra/StaticWickTheorem.lean
index eb4572ea..599deef2 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/StaticWickTheorem.lean
+++ b/HepLean/PerturbationTheory/FieldOpAlgebra/StaticWickTheorem.lean
@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
 import HepLean.PerturbationTheory.WickContraction.StaticContract
-import HepLean.PerturbationTheory.WicksTheorem
+import HepLean.PerturbationTheory.FieldOpAlgebra.WicksTheorem
 import HepLean.Meta.Remark.Basic
 /-!
 
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/SuperCommute.lean b/HepLean/PerturbationTheory/FieldOpAlgebra/SuperCommute.lean
similarity index 99%
rename from HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/SuperCommute.lean
rename to HepLean/PerturbationTheory/FieldOpAlgebra/SuperCommute.lean
index 81e06a76..68a18512 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/SuperCommute.lean
+++ b/HepLean/PerturbationTheory/FieldOpAlgebra/SuperCommute.lean
@@ -3,8 +3,8 @@ Copyright (c) 2025 Joseph Tooby-Smith. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.TimeOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.Basic
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.TimeOrder
+import HepLean.PerturbationTheory.FieldOpAlgebra.Basic
 /-!
 
 # SuperCommute on Field operator algebra
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/TimeContraction.lean b/HepLean/PerturbationTheory/FieldOpAlgebra/TimeContraction.lean
similarity index 97%
rename from HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/TimeContraction.lean
rename to HepLean/PerturbationTheory/FieldOpAlgebra/TimeContraction.lean
index f74482e5..12d0a427 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/TimeContraction.lean
+++ b/HepLean/PerturbationTheory/FieldOpAlgebra/TimeContraction.lean
@@ -3,8 +3,8 @@ Copyright (c) 2025 Joseph Tooby-Smith. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.NormalOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.TimeOrder
+import HepLean.PerturbationTheory.FieldOpAlgebra.NormalOrder
+import HepLean.PerturbationTheory.FieldOpAlgebra.TimeOrder
 /-!
 
 # Time contractions
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/TimeOrder.lean b/HepLean/PerturbationTheory/FieldOpAlgebra/TimeOrder.lean
similarity index 99%
rename from HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/TimeOrder.lean
rename to HepLean/PerturbationTheory/FieldOpAlgebra/TimeOrder.lean
index d5407c53..afbf9dd4 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/TimeOrder.lean
+++ b/HepLean/PerturbationTheory/FieldOpAlgebra/TimeOrder.lean
@@ -3,8 +3,8 @@ Copyright (c) 2025 Joseph Tooby-Smith. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.TimeOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.SuperCommute
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.TimeOrder
+import HepLean.PerturbationTheory.FieldOpAlgebra.SuperCommute
 /-!
 
 # Time Ordering on Field operator algebra
diff --git a/HepLean/PerturbationTheory/WicksTheorem.lean b/HepLean/PerturbationTheory/FieldOpAlgebra/WicksTheorem.lean
similarity index 100%
rename from HepLean/PerturbationTheory/WicksTheorem.lean
rename to HepLean/PerturbationTheory/FieldOpAlgebra/WicksTheorem.lean
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/WicksTheoremNormal.lean b/HepLean/PerturbationTheory/FieldOpAlgebra/WicksTheoremNormal.lean
similarity index 99%
rename from HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/WicksTheoremNormal.lean
rename to HepLean/PerturbationTheory/FieldOpAlgebra/WicksTheoremNormal.lean
index ccd787ae..d2c68756 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpAlgebra/WicksTheoremNormal.lean
+++ b/HepLean/PerturbationTheory/FieldOpAlgebra/WicksTheoremNormal.lean
@@ -5,7 +5,7 @@ Authors: Joseph Tooby-Smith
 -/
 import HepLean.PerturbationTheory.WickContraction.TimeCond
 import HepLean.PerturbationTheory.WickContraction.Sign.Join
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.StaticWickTheorem
+import HepLean.PerturbationTheory.FieldOpAlgebra.StaticWickTheorem
 import HepLean.Meta.Remark.Basic
 /-!
 
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/Basic.lean b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/Basic.lean
similarity index 100%
rename from HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/Basic.lean
rename to HepLean/PerturbationTheory/FieldOpFreeAlgebra/Basic.lean
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/Grading.lean b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/Grading.lean
similarity index 99%
rename from HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/Grading.lean
rename to HepLean/PerturbationTheory/FieldOpFreeAlgebra/Grading.lean
index 5a8acef2..8f0c9df8 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/Grading.lean
+++ b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/Grading.lean
@@ -3,7 +3,7 @@ Copyright (c) 2025 Joseph Tooby-Smith. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.Basic
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.Basic
 import HepLean.PerturbationTheory.Koszul.KoszulSign
 import Mathlib.RingTheory.GradedAlgebra.Basic
 /-!
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/NormTimeOrder.lean b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/NormTimeOrder.lean
similarity index 94%
rename from HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/NormTimeOrder.lean
rename to HepLean/PerturbationTheory/FieldOpFreeAlgebra/NormTimeOrder.lean
index 8343080b..e247bafd 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/NormTimeOrder.lean
+++ b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/NormTimeOrder.lean
@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
 import HepLean.PerturbationTheory.FieldSpecification.TimeOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.Basic
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.Basic
 import HepLean.PerturbationTheory.Koszul.KoszulSign
 /-!
 
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/NormalOrder.lean b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/NormalOrder.lean
similarity index 99%
rename from HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/NormalOrder.lean
rename to HepLean/PerturbationTheory/FieldOpFreeAlgebra/NormalOrder.lean
index 6dea226d..f3212ca2 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/NormalOrder.lean
+++ b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/NormalOrder.lean
@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
 import HepLean.PerturbationTheory.FieldSpecification.NormalOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.SuperCommute
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.SuperCommute
 import HepLean.PerturbationTheory.Koszul.KoszulSign
 /-!
 
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/SuperCommute.lean b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/SuperCommute.lean
similarity index 99%
rename from HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/SuperCommute.lean
rename to HepLean/PerturbationTheory/FieldOpFreeAlgebra/SuperCommute.lean
index e588bb98..05d8dd65 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/SuperCommute.lean
+++ b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/SuperCommute.lean
@@ -3,8 +3,8 @@ Copyright (c) 2025 Joseph Tooby-Smith. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.Basic
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.Grading
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.Basic
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.Grading
 /-!
 
 # Super Commute
diff --git a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/TimeOrder.lean b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/TimeOrder.lean
similarity index 99%
rename from HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/TimeOrder.lean
rename to HepLean/PerturbationTheory/FieldOpFreeAlgebra/TimeOrder.lean
index e729e321..6a5ec8f8 100644
--- a/HepLean/PerturbationTheory/Algebras/FieldOpFreeAlgebra/TimeOrder.lean
+++ b/HepLean/PerturbationTheory/FieldOpFreeAlgebra/TimeOrder.lean
@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
 import HepLean.PerturbationTheory.FieldSpecification.TimeOrder
-import HepLean.PerturbationTheory.Algebras.FieldOpFreeAlgebra.SuperCommute
+import HepLean.PerturbationTheory.FieldOpFreeAlgebra.SuperCommute
 import HepLean.PerturbationTheory.Koszul.KoszulSign
 /-!
 
diff --git a/HepLean/PerturbationTheory/WickContraction/Basic.lean b/HepLean/PerturbationTheory/WickContraction/Basic.lean
index 1d27072c..b6227ff3 100644
--- a/HepLean/PerturbationTheory/WickContraction/Basic.lean
+++ b/HepLean/PerturbationTheory/WickContraction/Basic.lean
@@ -3,7 +3,7 @@ Copyright (c) 2025 Joseph Tooby-Smith. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.NormalOrder
+import HepLean.PerturbationTheory.FieldOpAlgebra.NormalOrder
 import HepLean.Mathematics.List.InsertIdx
 /-!
 
diff --git a/HepLean/PerturbationTheory/WickContraction/Join.lean b/HepLean/PerturbationTheory/WickContraction/Join.lean
index b474e611..67b8e5fd 100644
--- a/HepLean/PerturbationTheory/WickContraction/Join.lean
+++ b/HepLean/PerturbationTheory/WickContraction/Join.lean
@@ -5,7 +5,7 @@ Authors: Joseph Tooby-Smith
 -/
 import HepLean.PerturbationTheory.WickContraction.TimeContract
 import HepLean.PerturbationTheory.WickContraction.StaticContract
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.TimeContraction
+import HepLean.PerturbationTheory.FieldOpAlgebra.TimeContraction
 import HepLean.PerturbationTheory.WickContraction.SubContraction
 import HepLean.PerturbationTheory.WickContraction.Singleton
 
diff --git a/HepLean/PerturbationTheory/WickContraction/StaticContract.lean b/HepLean/PerturbationTheory/WickContraction/StaticContract.lean
index 49c368ee..e16a0832 100644
--- a/HepLean/PerturbationTheory/WickContraction/StaticContract.lean
+++ b/HepLean/PerturbationTheory/WickContraction/StaticContract.lean
@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
 import HepLean.PerturbationTheory.WickContraction.Sign.Basic
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.TimeContraction
+import HepLean.PerturbationTheory.FieldOpAlgebra.TimeContraction
 /-!
 
 # Time contractions
diff --git a/HepLean/PerturbationTheory/WickContraction/SubContraction.lean b/HepLean/PerturbationTheory/WickContraction/SubContraction.lean
index 0f9d75fc..6378c7e0 100644
--- a/HepLean/PerturbationTheory/WickContraction/SubContraction.lean
+++ b/HepLean/PerturbationTheory/WickContraction/SubContraction.lean
@@ -5,7 +5,7 @@ Authors: Joseph Tooby-Smith
 -/
 import HepLean.PerturbationTheory.WickContraction.TimeContract
 import HepLean.PerturbationTheory.WickContraction.StaticContract
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.TimeContraction
+import HepLean.PerturbationTheory.FieldOpAlgebra.TimeContraction
 /-!
 
 # Sub contractions
diff --git a/HepLean/PerturbationTheory/WickContraction/TimeContract.lean b/HepLean/PerturbationTheory/WickContraction/TimeContract.lean
index c1d588c8..65632aa7 100644
--- a/HepLean/PerturbationTheory/WickContraction/TimeContract.lean
+++ b/HepLean/PerturbationTheory/WickContraction/TimeContract.lean
@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Tooby-Smith
 -/
 import HepLean.PerturbationTheory.WickContraction.Sign.Basic
-import HepLean.PerturbationTheory.Algebras.FieldOpAlgebra.TimeContraction
+import HepLean.PerturbationTheory.FieldOpAlgebra.TimeContraction
 /-!
 
 # Time contractions
diff --git a/README.md b/README.md
index e65e9752..fa9f7163 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@ __BSM physics [🗂️](https://heplean.github.io/HepLean/docs/HepLean/BeyondThe
 
 __Flavor physics [🗂️](https://heplean.github.io/HepLean/docs/HepLean/FlavorPhysics/CKMMatrix/Basic.html):__ Properties of the CKM matrix.
 
-__Perturbation Theory [🗂️](https://heplean.github.io/HepLean/docs/HepLean/PerturbationTheory/WicksTheorem.html):__ Time-dependent version of Wick's theorem for both fermions and bosons.
+__Perturbation Theory [🗂️](https://heplean.github.io/HepLean/docs/HepLean/PerturbationTheory/FieldOpAlgebra/WicksTheorem.html):__ Time-dependent version of Wick's theorem for both fermions and bosons.
 
 ## Associated media and publications
 - [📄](https://arxiv.org/abs/2405.08863) Joseph Tooby-Smith,