diff --git a/algebra/group_constructions.hlean b/algebra/group_constructions.hlean
index fe40ead..7f351c6 100644
--- a/algebra/group_constructions.hlean
+++ b/algebra/group_constructions.hlean
@@ -184,7 +184,7 @@ namespace group
     is_contr (Σ(g : quotient_group N →g G'), g ∘g gq_map N = f) :=
   sorry
 
-  /- Binary products (direct sums) of Groups -/
+  /- Binary products (direct product) of Groups -/
   definition product_one [constructor] : G × G' := (one, one)
   definition product_inv [unfold 3] : G × G' → G × G' :=
   λv, (v.1⁻¹, v.2⁻¹)
diff --git a/homotopy/spectrum.hlean b/homotopy/spectrum.hlean
index fce26d2..489156c 100644
--- a/homotopy/spectrum.hlean
+++ b/homotopy/spectrum.hlean
@@ -170,6 +170,16 @@ namespace pointed
     pequiv_of_equiv (pi_equiv_pi_right g)
       begin esimp, apply eq_of_homotopy, intros a, esimp, exact (respect_pt (g a)) end
 
+  definition pcast_commute [constructor] {A : Type} {B C : A → Type*} (f : Πa, B a →* C a)
+    {a₁ a₂ : A} (p : a₁ = a₂) : pcast (ap C p) ∘* f a₁ ~* f a₂ ∘* pcast (ap B p) :=
+  phomotopy.mk
+    begin induction p, reflexivity end
+    begin induction p, esimp, refine !idp_con ⬝ !idp_con ⬝ !ap_id⁻¹ end
+
+  definition pequiv_of_eq_commute [constructor] {A : Type} {B C : A → Type*} (f : Πa, B a →* C a)
+    {a₁ a₂ : A} (p : a₁ = a₂) : pequiv_of_eq (ap C p) ∘* f a₁ ~* f a₂ ∘* pequiv_of_eq (ap B p) :=
+  pcast_commute f p
+
 end pointed
 open pointed
 
@@ -401,17 +411,30 @@ namespace spectrum
 
    definition π_glue (X : spectrum) (n : ℤ) : π*[2] (X (2 - succ n)) ≃* π*[3] (X (2 - n)) :=
   begin
-    symmetry,
-    refine pequiv_of_eq (phomotopy_group_succ_in (X (2 - n)) 2) ⬝e* _,
-    assert H : 2 - n = succ (2 - succ n), exact (sub_add_cancel (2-n) 1)⁻¹ ⬝ ap succ !sub_sub,
-    refine phomotopy_group_pequiv 2 (loop_pequiv_loop (pequiv_of_eq (ap X H))) ⬝e* _,
-    exact phomotopy_group_pequiv 2 (equiv_glue X (2 - succ n))⁻¹ᵉ*
+    refine phomotopy_group_pequiv 2 (equiv_glue X (2 - succ n)) ⬝e* _,
+    assert H : succ (2 - succ n) = 2 - n, exact ap succ !sub_sub⁻¹ ⬝ sub_add_cancel (2-n) 1,
+    refine pequiv_of_eq (ap (λn, π*[2] (Ω (X n))) H) ⬝e* _,
+    refine (pequiv_of_eq (phomotopy_group_succ_in (X (2 - n)) 2))⁻¹ᵉ*,
   end
 
-  /- TODO: fill in sorry -/
   definition π_glue_square {X Y : spectrum} (f : X →ₛ Y) (n : ℤ) :
     π_glue Y n ∘* π→*[2] (f (2 - succ n)) ~* π→*[3] (f (2 - n)) ∘* π_glue X n :=
-  sorry
+  begin
+    refine !passoc ⬝* _,
+    assert H1 : phomotopy_group_pequiv 2 (equiv_glue Y (2 - succ n)) ∘* π→*[2] (f (2 - succ n))
+     ~* π→*[2] (Ω→ (f (succ (2 - succ n)))) ∘* phomotopy_group_pequiv 2 (equiv_glue X (2 - succ n)),
+    { refine !phomotopy_group_functor_compose⁻¹* ⬝* _,
+      refine phomotopy_group_functor_phomotopy 2 !sglue_square ⬝* _,
+      apply phomotopy_group_functor_compose },
+    refine pwhisker_left _ H1 ⬝* _, clear H1,
+    refine !passoc⁻¹* ⬝* _ ⬝* !passoc,
+    apply pwhisker_right,
+    rewrite [+ to_pmap_pequiv_trans],
+    refine !passoc ⬝* _,
+    refine pwhisker_left _ !pequiv_of_eq_commute ⬝* _,
+    refine !passoc⁻¹* ⬝* _ ⬝* !passoc,
+    reflexivity -- if we generalize 2 to n, this is not reflexivity anymore
+  end
 
   section
   open chain_complex prod fin group
@@ -441,8 +464,8 @@ namespace spectrum
   definition is_homomorphism_LES_of_shomotopy_groups :
     Π(v : +3ℤ), is_homomorphism (cc_to_fn LES_of_shomotopy_groups v)
   | (n, fin.mk 0 H) := proof homomorphism.struct (πₛ→[n] f) qed
-  | (n, fin.mk 1 H) := proof homomorphism.struct (πₛ→[n] (spoint f))  qed
-  | (n, fin.mk 2 H) := proof is_homomorphism_compose sorry sorry qed
+  | (n, fin.mk 1 H) := proof homomorphism.struct (πₛ→[n] (spoint f)) qed
+  | (n, fin.mk 2 H) := begin exact sorry end
   | (n, fin.mk (k+3) H) := begin exfalso, apply lt_le_antisymm H, apply le_add_left end
 
   -- In the comments below is a start on an explicit description of the LES for spectra
diff --git a/homotopy/splice.hlean b/homotopy/splice.hlean
index 0066390..3524106 100644
--- a/homotopy/splice.hlean
+++ b/homotopy/splice.hlean
@@ -63,31 +63,7 @@ begin
   { exact dif_pos p}
 end
 
---   definition splice_type {N M : succ_str} (G : N → chain_complex M) (k : ℕ) (m : M)
---     (x : stratified N k) : Set* :=
---   G x.1 (iterate S (val x.2) m)
-
--- --   definition splice_map {N M : succ_str} (G : N → chain_complex M) (k : ℕ) (m : M)
--- --     (x : stratified N k) : Set* :=
--- --   G x.1 (iterate S (val x.2) m)
-
---   definition splice (N M : succ_str) (G : N → chain_complex M) (k : ℕ) (m : M)
---     (e0 : Πn, G n m ≃* G (S n) (S (iterate S k m))) :
---     chain_complex (stratified N k) :=
---   chain_complex.mk (splice_type G k m)
---     begin
---       intro x, cases x with n l, cases l with l H,
---       refine if K : l = k then _ else _,
---       { intro p, induction p, exact sorry},
---       { exact sorry}
---       -- cases l with l,
---       -- { },
---       -- { }
---     end
---     begin
---       exact sorry
---     end
-
+  --move
   definition succ_str.add [reducible] {N : succ_str} (n : N) (k : ℕ) : N :=
   iterate S k n