Definition le_pred: forall n m : nat, n <= m -> pred n <= pred m :=
fun (n m : nat) (H : n <= m) =>
le_ind n (fun m0 : nat => pred n <= pred m0) (le_n (pred n))
  (fun (m0 : nat) (H0 : n <= m0) (IHle : pred n <= pred m0) =>
   match
     m0 as n0 return (n <= n0 -> pred n <= pred n0 -> pred n <= pred (S n0))
   with
   | 0 => fun (_ : n <= 0) (IHle0 : pred n <= pred 0) => IHle0
   | S m1 =>
       fun (_ : n <= S m1) (IHle0 : pred n <= pred (S m1)) =>
       le_S (pred n) m1 IHle0
   end H0 IHle) m H.Definition le_S_n : forall n m : nat, S n <= S m -> n <= m  :=
   fun n m => le_pred (S n) (S m).Definition max_l: forall n m : nat, m <= n -> max n m = n :=
fun n : nat =>
nat_ind (fun n0 : nat => forall m : nat, m <= n0 -> max n0 m = n0)
  (fun m : nat =>
   match m as n0 return (n0 <= 0 -> max 0 n0 = 0) with
   | 0 => fun _ : 0 <= 0 => eq_refl
   | S m0 =>
       fun H : S m0 <= 0 =>
       (fun H0 : 0 = 0 -> S m0 = 0 => H0 eq_refl)
         match H in (_ <= n0) return (n0 = 0 -> S m0 = 0) with
         | le_n =>
             fun H0 : S m0 = 0 =>
             (fun H1 : S m0 = 0 =>
              (fun H2 : False =>
               (fun H3 : False => False_ind (S m0 = 0) H3) H2)
                (eq_ind (S m0)
                   (fun e : nat =>
                    match e with
                    | 0 => False
                    | S _ => True
                    end) I 0 H1)) H0
         | le_S m1 H0 =>
             fun H1 : S m1 = 0 =>
             (fun H2 : S m1 = 0 =>
              (fun H3 : False =>
               (fun H4 : False => False_ind (S m0 <= m1 -> S m0 = 0) H4) H3)
                (eq_ind (S m1)
                   (fun e : nat =>
                    match e with
                    | 0 => False
                    | S _ => True
                    end) I 0 H2)) H1 H0
         end
   end)
  (fun (n0 : nat) (IHn : forall m : nat, m <= n0 -> max n0 m = n0) (m : nat) =>
   match m as n1 return (n1 <= S n0 -> max (S n0) n1 = S n0) with
   | 0 => fun _ : 0 <= S n0 => eq_refl
   | S m0 =>
       fun H : S m0 <= S n0 => f_equal S (IHn m0 (le_S_n m0 n0 H))
   end) n.Definition max_r     : forall n m : nat, n <= m -> max n m = m :=
fun n : nat =>
nat_ind (fun n0 : nat => forall m : nat, n0 <= m -> max n0 m = m)
  (fun m : nat =>
   match m as n0 return (0 <= n0 -> max 0 n0 = n0) with
   | 0 => fun _ : 0 <= 0 => eq_refl
   | S m0 => fun _ : 0 <= S m0 => eq_refl
   end)
  (fun (n0 : nat) (IHn : forall m : nat, n0 <= m -> max n0 m = m) (m : nat) =>
   match m as n1 return (S n0 <= n1 -> max (S n0) n1 = n1) with
   | 0 =>
       fun H : S n0 <= 0 =>
       (fun H0 : 0 = 0 -> S n0 = 0 => H0 eq_refl)
         match H in (_ <= n1) return (n1 = 0 -> S n0 = 0) with
         | le_n =>
             fun H0 : S n0 = 0 =>
             (fun H1 : S n0 = 0 =>
              (fun H2 : False =>
               (fun H3 : False => False_ind (S n0 = 0) H3) H2)
                (eq_ind (S n0)
                   (fun e : nat =>
                    match e with
                    | 0 => False
                    | S _ => True
                    end) I 0 H1)) H0
         | le_S m0 H0 =>
             fun H1 : S m0 = 0 =>
             (fun H2 : S m0 = 0 =>
              (fun H3 : False =>
               (fun H4 : False => False_ind (S n0 <= m0 -> S n0 = 0) H4) H3)
                (eq_ind (S m0)
                   (fun e : nat =>
                    match e with
                    | 0 => False
                    | S _ => True
                    end) I 0 H2)) H1 H0
         end
   | S m0 =>
       fun H : S n0 <= S m0 => f_equal S (IHn m0 (le_S_n n0 m0 H))
   end) n.Definition le_n_S : forall n m : nat, n <= m -> S n <= S m :=
fun (n m : nat) (H : n <= m) =>
le_ind n (fun m0 : nat => S n <= S m0) (le_n (S n))
  (fun (m0 : nat) (_ : n <= m0) (IHle : S n <= S m0) =>
   le_S (S n) (S m0) IHle) m H.Definition lt_n_S: forall n m : nat, n < m -> S n < S m :=
fun (n m : nat) (H : n < m) => le_n_S (S n) m H.Definition le_trans: forall n m p : nat, n <= m -> m <= p -> n <= p :=
fun (n m p : nat) (H : n <= m) (H0 : m <= p) =>
le_ind m (fun p0 : nat => n <= p0) H
  (fun (m0 : nat) (_ : m <= m0) (IHle : n <= m0) => le_S n m0 IHle) p H0.Definition le_Sn_le: forall n m : nat, S n <= m -> n <= m :=
fun (n m : nat) (H : S n <= m) => le_trans n (S n) m (le_S n n (le_n n)) H.Definition lt_le_weak: forall n m : nat, n < m -> n <= m :=
fun (n m : nat) (H : n < m) => le_Sn_le n m H.

Lemma le_or_lt: forall n m : nat, n <= m \/ m < n.