diff --git a/ConNF.lean b/ConNF.lean
index 0b081c4baf..da084e0f6e 100644
--- a/ConNF.lean
+++ b/ConNF.lean
@@ -15,6 +15,7 @@ import ConNF.Construction.Hailperin
 import ConNF.Construction.InductionStatement
 import ConNF.Construction.NewModelData
 import ConNF.Construction.RaiseStrong
+import ConNF.Construction.Result
 import ConNF.Construction.RunInduction
 import ConNF.Construction.TTT
 import ConNF.Counting.BaseCoding
diff --git a/ConNF/Construction/Hailperin.lean b/ConNF/Construction/Hailperin.lean
index a6aa6cd222..1fc40153db 100644
--- a/ConNF/Construction/Hailperin.lean
+++ b/ConNF/Construction/Hailperin.lean
@@ -379,7 +379,8 @@ theorem exists_cardinalOne :
 
 theorem exists_subset :
     ∃ x : TSet α, ∀ a b, op hγ hδ a b ∈[hβ] x ↔ ∀ c : TSet ε, c ∈[hε] a → c ∈[hε] b := by
-  have := exists_of_symmetric {a | ∃ b c, a = op hγ hδ b c ∧ ∀ d : TSet ε, d ∈[hε] b → d ∈[hε] c} hβ ?_
+  have := exists_of_symmetric {a | ∃ b c, a = op hγ hδ b c ∧
+      ∀ d : TSet ε, d ∈[hε] b → d ∈[hε] c} hβ ?_
   · obtain ⟨y, hy⟩ := this
     use y
     intro a b
diff --git a/ConNF/Construction/Result.lean b/ConNF/Construction/Result.lean
new file mode 100644
index 0000000000..11a38b311d
--- /dev/null
+++ b/ConNF/Construction/Result.lean
@@ -0,0 +1,82 @@
+import ConNF.Construction.Hailperin
+
+/-!
+# New file
+
+In this file...
+
+## Main declarations
+
+* `ConNF.foo`: Something new.
+-/
+
+noncomputable section
+universe u
+
+open Cardinal Ordinal ConNF.TSet
+
+namespace ConNF
+
+variable [Params.{u}] {α β γ δ ε ζ : Λ} (hβ : (β : TypeIndex) < α) (hγ : (γ : TypeIndex) < β)
+  (hδ : (δ : TypeIndex) < γ) (hε : (ε : TypeIndex) < δ) (hζ : (ζ : TypeIndex) < ε)
+
+theorem ext (x y : TSet α) :
+    (∀ z : TSet β, z ∈[hβ] x ↔ z ∈[hβ] y) → x = y :=
+  tSet_ext' hβ x y
+
+theorem exists_inter (x y : TSet α) :
+    ∃ w : TSet α, ∀ z : TSet β, z ∈[hβ] w ↔ z ∈[hβ] x ∧ z ∈[hβ] y :=
+  TSet.exists_inter hβ x y
+
+theorem exists_compl (x : TSet α) :
+    ∃ y : TSet α, ∀ z : TSet β, z ∈[hβ] y ↔ ¬z ∈[hβ] x :=
+  TSet.exists_compl hβ x
+
+theorem mem_singleton_iff (x y : TSet β) :
+    y ∈[hβ] singleton hβ x ↔ y = x :=
+  typedMem_singleton_iff' hβ x y
+
+theorem mem_up_iff (x y z : TSet β) :
+    z ∈[hβ] up hβ x y ↔ z = x ∨ z = y :=
+  TSet.mem_up_iff hβ x y z
+
+theorem op_def (x y : TSet γ) :
+    op hβ hγ x y = up hβ (singleton hγ x) (up hγ x y) :=
+  rfl
+
+theorem exists_singletonImage (x : TSet β) :
+    ∃ y : TSet α, ∀ z w,
+    op hγ hδ (singleton hε z) (singleton hε w) ∈[hβ] y ↔ op hδ hε z w ∈[hγ] x :=
+  TSet.exists_singletonImage hβ hγ hδ hε x
+
+theorem exists_insertion2 (x : TSet γ) :
+    ∃ y : TSet α, ∀ a b c, op hγ hδ (singleton hε (singleton hζ a)) (op hε hζ b c) ∈[hβ] y ↔
+    op hε hζ a c ∈[hδ] x :=
+  TSet.exists_insertion2 hβ hγ hδ hε hζ x
+
+theorem exists_insertion3 (x : TSet γ) :
+    ∃ y : TSet α, ∀ a b c, op hγ hδ (singleton hε (singleton hζ a)) (op hε hζ b c) ∈[hβ] y ↔
+    op hε hζ a b ∈[hδ] x :=
+  TSet.exists_insertion3 hβ hγ hδ hε hζ x
+
+theorem exists_cross (x : TSet γ) :
+    ∃ y : TSet α, ∀ a, a ∈[hβ] y ↔ ∃ b c, a = op hγ hδ b c ∧ c ∈[hδ] x :=
+  TSet.exists_cross hβ hγ hδ x
+
+theorem exists_typeLower (x : TSet α) :
+    ∃ y : TSet δ, ∀ a, a ∈[hε] y ↔ ∀ b, op hγ hδ b (singleton hε a) ∈[hβ] x :=
+  TSet.exists_typeLower hβ hγ hδ hε x
+
+theorem exists_converse (x : TSet α) :
+    ∃ y : TSet α, ∀ a b, op hγ hδ a b ∈[hβ] y ↔ op hγ hδ b a ∈[hβ] x :=
+  TSet.exists_converse hβ hγ hδ x
+
+theorem exists_cardinalOne :
+    ∃ x : TSet α, ∀ a : TSet β, a ∈[hβ] x ↔ ∃ b, ∀ c : TSet γ, c ∈[hγ] a ↔ c = b :=
+  TSet.exists_cardinalOne hβ hγ
+
+theorem exists_subset :
+    ∃ x : TSet α, ∀ a b, op hγ hδ a b ∈[hβ] x ↔ ∀ c : TSet ε, c ∈[hε] a → c ∈[hε] b :=
+  TSet.exists_subset hβ hγ hδ hε
+
+end ConNF