Section TNF.
Fixpoint list_nat_sum(ls:list nat):nat :=
match ls with
| nil => O
| h::t => h+(list_nat_sum t)
end.
Definition isHaltTrans(tr:option (Trans Σ)):nat :=
match tr with
| Some _ => 0
| None => 1
end.
Definition CountHaltTrans tm :=
list_nat_sum (map (fun s=>list_nat_sum (map (fun i => isHaltTrans (tm s i)) Σ_list)) St_list).
Ltac destruct_and :=
match goal with
| H:?A/\?B |- _ => destruct H
end.
Record TNF_Node := {
TNF_tm: TM Σ;
TNF_cnt: nat;
TNF_ptr: St;
}.
Definition TNF_Node_WF(x:TNF_Node):Prop :=
let (tm,cnt,ptr) := x in
cnt = CountHaltTrans tm /\
cnt <> 0 /\
UnusedState_ptr tm ptr.
Definition Trans_list:=
{| nxt:=St0; dir:=Dneg; out:=Σ0 |}::
{| nxt:=St0; dir:=Dneg; out:=Σ1 |}::
{| nxt:=St0; dir:=Dpos; out:=Σ0 |}::
{| nxt:=St0; dir:=Dpos; out:=Σ1 |}::
{| nxt:=St1; dir:=Dneg; out:=Σ0 |}::
{| nxt:=St1; dir:=Dneg; out:=Σ1 |}::
{| nxt:=St1; dir:=Dpos; out:=Σ0 |}::
{| nxt:=St1; dir:=Dpos; out:=Σ1 |}::
{| nxt:=St2; dir:=Dneg; out:=Σ0 |}::
{| nxt:=St2; dir:=Dneg; out:=Σ1 |}::
{| nxt:=St2; dir:=Dpos; out:=Σ0 |}::
{| nxt:=St2; dir:=Dpos; out:=Σ1 |}::
{| nxt:=St3; dir:=Dneg; out:=Σ0 |}::
{| nxt:=St3; dir:=Dneg; out:=Σ1 |}::
{| nxt:=St3; dir:=Dpos; out:=Σ0 |}::
{| nxt:=St3; dir:=Dpos; out:=Σ1 |}::
nil.
Definition St_leb s1 s2 :=
Nat.leb (St_to_nat s2) (St_to_nat s1).

Lemma St_leb_spec s1 s2:
if St_leb s1 s2 then St_le s1 s2 else ~(St_le s1 s2).