include "iso/fwd.ma".
+theorem iso_refl:
+ \forall (t: T).(iso t t)
+\def
+ \lambda (t: T).(T_ind (\lambda (t0: T).(iso t0 t0)) (\lambda (n:
+nat).(iso_sort n n)) (\lambda (n: nat).(iso_lref n n)) (\lambda (k:
+K).(\lambda (t0: T).(\lambda (_: (iso t0 t0)).(\lambda (t1: T).(\lambda (_:
+(iso t1 t1)).(iso_head t0 t0 t1 t1 k)))))) t).
+
theorem iso_trans:
\forall (t1: T).(\forall (t2: T).((iso t1 t2) \to (\forall (t3: T).((iso t2
t3) \to (iso t1 t3)))))