DEFINITION pc3_pr0_pr2_t()
TYPE =
       ∀u1:T.∀u2:T.(pr0 u2 u1)→∀c:C.∀t1:T.∀t2:T.∀k:K.(pr2 (CHead c k u2) t1 t2)→(pc3 (CHead c k u1) t1 t2)
BODY =
        assume u1: T
        assume u2: T
        suppose H: pr0 u2 u1
        assume c: C
        assume t1: T
        assume t2: T
        assume k: K
        suppose H0: pr2 (CHead c k u2) t1 t2
           assume y: C
           suppose H1: pr2 y t1 t2
             we proceed by induction on H1 to prove (eq C y (CHead c k u2))→(pc3 (CHead c k u1) t1 t2)
                case pr2_free : c0:C t3:T t4:T H2:pr0 t3 t4 ⇒
                   the thesis becomes ∀H3:(eq C c0 (CHead c k u2)).(pc3 (CHead c k u1) t3 t4)
                      suppose H3: eq C c0 (CHead c k u2)
                         by (pr2_free . . . H2)
                         we proved pr2 (CHead c k u1) t3 t4
                         by (pc3_pr2_r . . . previous)
                         we proved pc3 (CHead c k u1) t3 t4
∀H3:(eq C c0 (CHead c k u2)).(pc3 (CHead c k u1) t3 t4)
                case pr2_delta : c0:C d:C u:T i:nat H2:getl i c0 (CHead d (Bind Abbr) u) t3:T t4:T H3:pr0 t3 t4 t:T H4:subst0 i u t4 t ⇒
                   the thesis becomes ∀H5:(eq C c0 (CHead c k u2)).(pc3 (CHead c k u1) t3 t)
                      suppose H5: eq C c0 (CHead c k u2)
                         (H6) 
                            by (f_equal . . . . . H5)
                            we proved eq C c0 (CHead c k u2)
eq C (λe:C.e c0) (λe:C.e (CHead c k u2))
                         end of H6
                         (H7) 
                            we proceed by induction on H6 to prove getl i (CHead c k u2) (CHead d (Bind Abbr) u)
                               case refl_equal : ⇒
                                  the thesis becomes the hypothesis H2
getl i (CHead c k u2) (CHead d (Bind Abbr) u)
                         end of H7
                          suppose H8: getl O (CHead c k u2) (CHead d (Bind Abbr) u)
                          suppose H9: subst0 O u t4 t
                            by (getl_gen_O . . H8)
                            we proved clear (CHead c k u2) (CHead d (Bind Abbr) u)
                               assume b: B
                               suppose H10: clear (CHead c (Bind b) u2) (CHead d (Bind Abbr) u)
                                  (H11) 
                                     by (clear_gen_bind . . . . H10)
                                     we proved eq C (CHead d (Bind Abbr) u) (CHead c (Bind b) u2)
                                     by (f_equal . . . . . previous)
                                     we proved 
                                        eq
                                          C
                                          <λ:C.C> CASE CHead d (Bind Abbr) u OF CSort ⇒d | CHead c1  ⇒c1
                                          <λ:C.C> CASE CHead c (Bind b) u2 OF CSort ⇒d | CHead c1  ⇒c1

                                        eq
                                          C
                                          λe:C.<λ:C.C> CASE e OF CSort ⇒d | CHead c1  ⇒c1 (CHead d (Bind Abbr) u)
                                          λe:C.<λ:C.C> CASE e OF CSort ⇒d | CHead c1  ⇒c1 (CHead c (Bind b) u2)
                                  end of H11
                                  (h1) 
                                     (H12) 
                                        by (clear_gen_bind . . . . H10)
                                        we proved eq C (CHead d (Bind Abbr) u) (CHead c (Bind b) u2)
                                        by (f_equal . . . . . previous)
                                        we proved 
                                           eq
                                             B
                                             <λ:C.B>
                                               CASE CHead d (Bind Abbr) u OF
                                                 CSort ⇒Abbr
                                               | CHead  k0 ⇒<λ:K.B> CASE k0 OF Bind b0⇒b0 | Flat ⇒Abbr
                                             <λ:C.B>
                                               CASE CHead c (Bind b) u2 OF
                                                 CSort ⇒Abbr
                                               | CHead  k0 ⇒<λ:K.B> CASE k0 OF Bind b0⇒b0 | Flat ⇒Abbr

                                           eq
                                             B
                                             λe:C
                                                 .<λ:C.B>
                                                   CASE e OF
                                                     CSort ⇒Abbr
                                                   | CHead  k0 ⇒<λ:K.B> CASE k0 OF Bind b0⇒b0 | Flat ⇒Abbr
                                               CHead d (Bind Abbr) u
                                             λe:C
                                                 .<λ:C.B>
                                                   CASE e OF
                                                     CSort ⇒Abbr
                                                   | CHead  k0 ⇒<λ:K.B> CASE k0 OF Bind b0⇒b0 | Flat ⇒Abbr
                                               CHead c (Bind b) u2
                                     end of H12
                                     (h1) 
                                        (H13) 
                                           by (clear_gen_bind . . . . H10)
                                           we proved eq C (CHead d (Bind Abbr) u) (CHead c (Bind b) u2)
                                           by (f_equal . . . . . previous)
                                           we proved 
                                              eq
                                                T
                                                <λ:C.T> CASE CHead d (Bind Abbr) u OF CSort ⇒u | CHead   t0⇒t0
                                                <λ:C.T> CASE CHead c (Bind b) u2 OF CSort ⇒u | CHead   t0⇒t0

                                              eq
                                                T
                                                λe:C.<λ:C.T> CASE e OF CSort ⇒u | CHead   t0⇒t0 (CHead d (Bind Abbr) u)
                                                λe:C.<λ:C.T> CASE e OF CSort ⇒u | CHead   t0⇒t0 (CHead c (Bind b) u2)
                                        end of H13
                                         suppose H14: eq B Abbr b
                                         suppose : eq C d c
                                           (H16) 
                                              consider H13
                                              we proved 
                                                 eq
                                                   T
                                                   <λ:C.T> CASE CHead d (Bind Abbr) u OF CSort ⇒u | CHead   t0⇒t0
                                                   <λ:C.T> CASE CHead c (Bind b) u2 OF CSort ⇒u | CHead   t0⇒t0
                                              that is equivalent to eq T u u2
                                              we proceed by induction on the previous result to prove subst0 O u2 t4 t
                                                 case refl_equal : ⇒
                                                    the thesis becomes the hypothesis H9
subst0 O u2 t4 t
                                           end of H16
                                           we proceed by induction on H14 to prove pc3 (CHead c (Bind b) u1) t3 t
                                              case refl_equal : ⇒
                                                 the thesis becomes pc3 (CHead c (Bind Abbr) u1) t3 t
                                                    by (pr0_subst0_fwd . . . . H16 . H)
                                                    we proved ex2 T λt:T.subst0 O u1 t4 t λt:T.pr0 t t
                                                    we proceed by induction on the previous result to prove pc3 (CHead c (Bind Abbr) u1) t3 t
                                                       case ex_intro2 : x:T H17:subst0 O u1 t4 x H18:pr0 t x ⇒
                                                          the thesis becomes pc3 (CHead c (Bind Abbr) u1) t3 t
                                                             (h1) 
                                                                by (getl_refl . . .)
                                                                we proved getl O (CHead c (Bind Abbr) u1) (CHead c (Bind Abbr) u1)
                                                                by (pr2_delta . . . . previous . . H3 . H17)
                                                                we proved pr2 (CHead c (Bind Abbr) u1) t3 x
                                                                by (pr3_pr2 . . . previous)
pr3 (CHead c (Bind Abbr) u1) t3 x
                                                             end of h1
                                                             (h2) 
                                                                by (pr2_free . . . H18)
                                                                we proved pr2 (CHead c (Bind Abbr) u1) t x
                                                                by (pr3_pr2 . . . previous)
pr3 (CHead c (Bind Abbr) u1) t x
                                                             end of h2
                                                             by (pc3_pr3_t . . . h1 . h2)
pc3 (CHead c (Bind Abbr) u1) t3 t
pc3 (CHead c (Bind Abbr) u1) t3 t
                                           we proved pc3 (CHead c (Bind b) u1) t3 t
(eq B Abbr b)→(eq C d c)→(pc3 (CHead c (Bind b) u1) t3 t)
                                     end of h1
                                     (h2) 
                                        consider H12
                                        we proved 
                                           eq
                                             B
                                             <λ:C.B>
                                               CASE CHead d (Bind Abbr) u OF
                                                 CSort ⇒Abbr
                                               | CHead  k0 ⇒<λ:K.B> CASE k0 OF Bind b0⇒b0 | Flat ⇒Abbr
                                             <λ:C.B>
                                               CASE CHead c (Bind b) u2 OF
                                                 CSort ⇒Abbr
                                               | CHead  k0 ⇒<λ:K.B> CASE k0 OF Bind b0⇒b0 | Flat ⇒Abbr
eq B Abbr b
                                     end of h2
                                     by (h1 h2)
(eq C d c)→(pc3 (CHead c (Bind b) u1) t3 t)
                                  end of h1
                                  (h2) 
                                     consider H11
                                     we proved 
                                        eq
                                          C
                                          <λ:C.C> CASE CHead d (Bind Abbr) u OF CSort ⇒d | CHead c1  ⇒c1
                                          <λ:C.C> CASE CHead c (Bind b) u2 OF CSort ⇒d | CHead c1  ⇒c1
eq C d c
                                  end of h2
                                  by (h1 h2)
                                  we proved pc3 (CHead c (Bind b) u1) t3 t

                                  ∀H10:clear (CHead c (Bind b) u2) (CHead d (Bind Abbr) u)
                                    .pc3 (CHead c (Bind b) u1) t3 t
                               assume f: F
                               suppose H10: clear (CHead c (Flat f) u2) (CHead d (Bind Abbr) u)
                                  (h1) 
                                     by (getl_refl . . .)
                                     we proved getl O (CHead d (Bind Abbr) u) (CHead d (Bind Abbr) u)
                                     by (pr2_delta . . . . previous . . H3 . H9)
                                     we proved pr2 (CHead d (Bind Abbr) u) t3 t
                                     by (pc3_pr2_r . . . previous)
pc3 (CHead d (Bind Abbr) u) t3 t
                                  end of h1
                                  (h2) 
                                     by (clear_gen_flat . . . . H10)
                                     we proved clear c (CHead d (Bind Abbr) u)
                                     by (clear_flat . . previous . .)
clear (CHead c (Flat f) u1) (CHead d (Bind Abbr) u)
                                  end of h2
                                  by (clear_pc3_trans . . . h1 . h2)
                                  we proved pc3 (CHead c (Flat f) u1) t3 t

                                  ∀H10:clear (CHead c (Flat f) u2) (CHead d (Bind Abbr) u)
                                    .pc3 (CHead c (Flat f) u1) t3 t
                            by (previous . previous)
                            we proved pc3 (CHead c k u1) t3 t

                            getl O (CHead c k u2) (CHead d (Bind Abbr) u)
                              →(subst0 O u t4 t)→(pc3 (CHead c k u1) t3 t)
                          assume i0: nat
                             suppose IHi: 
                                getl i0 (CHead c k u2) (CHead d (Bind Abbr) u)
                                  →(subst0 i0 u t4 t)→(pc3 (CHead c k u1) t3 t)
                             suppose H8: getl (S i0) (CHead c k u2) (CHead d (Bind Abbr) u)
                             suppose H9: subst0 (S i0) u t4 t
                               by (getl_gen_S . . . . . H8)
                               we proved getl (r k i0) c (CHead d (Bind Abbr) u)
                                  assume b: B
                                   suppose : 
                                      getl i0 (CHead c (Bind b) u2) (CHead d (Bind Abbr) u)
                                        →(subst0 i0 u t4 t)→(pc3 (CHead c (Bind b) u1) t3 t)
                                   suppose H10: getl (r (Bind b) i0) c (CHead d (Bind Abbr) u)
                                     by (getl_head . . . . H10 .)
                                     we proved getl (S i0) (CHead c (Bind b) u1) (CHead d (Bind Abbr) u)
                                     by (pr2_delta . . . . previous . . H3 . H9)
                                     we proved pr2 (CHead c (Bind b) u1) t3 t
                                     by (pc3_pr2_r . . . previous)
                                     we proved pc3 (CHead c (Bind b) u1) t3 t

                                     getl i0 (CHead c (Bind b) u2) (CHead d (Bind Abbr) u)
                                         →(subst0 i0 u t4 t)→(pc3 (CHead c (Bind b) u1) t3 t)
                                       →∀H10:getl (r (Bind b) i0) c (CHead d (Bind Abbr) u)
                                            .pc3 (CHead c (Bind b) u1) t3 t
                                  assume f: F
                                   suppose : 
                                      getl i0 (CHead c (Flat f) u2) (CHead d (Bind Abbr) u)
                                        →(subst0 i0 u t4 t)→(pc3 (CHead c (Flat f) u1) t3 t)
                                   suppose H10: getl (r (Flat f) i0) c (CHead d (Bind Abbr) u)
                                     consider H9
                                     we proved subst0 (S i0) u t4 t
                                     that is equivalent to subst0 (r (Flat f) i0) u t4 t
                                     by (pr2_delta . . . . H10 . . H3 . previous)
                                     we proved pr2 c t3 t
                                     by (pr2_cflat . . . previous . .)
                                     we proved pr2 (CHead c (Flat f) u1) t3 t
                                     by (pc3_pr2_r . . . previous)
                                     we proved pc3 (CHead c (Flat f) u1) t3 t

                                     getl i0 (CHead c (Flat f) u2) (CHead d (Bind Abbr) u)
                                         →(subst0 i0 u t4 t)→(pc3 (CHead c (Flat f) u1) t3 t)
                                       →∀H10:getl (r (Flat f) i0) c (CHead d (Bind Abbr) u)
                                            .pc3 (CHead c (Flat f) u1) t3 t
                               by (previous . IHi previous)
                               we proved pc3 (CHead c k u1) t3 t

                               ∀H8:getl (S i0) (CHead c k u2) (CHead d (Bind Abbr) u)
                                 .∀H9:(subst0 (S i0) u t4 t).(pc3 (CHead c k u1) t3 t)
                         by (previous . H7 H4)
                         we proved pc3 (CHead c k u1) t3 t
∀H5:(eq C c0 (CHead c k u2)).(pc3 (CHead c k u1) t3 t)
             we proved (eq C y (CHead c k u2))→(pc3 (CHead c k u1) t1 t2)
          we proved ∀y:C.(pr2 y t1 t2)→(eq C y (CHead c k u2))→(pc3 (CHead c k u1) t1 t2)
          by (insert_eq . . . . previous H0)
          we proved pc3 (CHead c k u1) t1 t2
       we proved ∀u1:T.∀u2:T.(pr0 u2 u1)→∀c:C.∀t1:T.∀t2:T.∀k:K.(pr2 (CHead c k u2) t1 t2)→(pc3 (CHead c k u1) t1 t2)