intros bound p q base H; case q; simpl in |- *; auto; intros; rewrite H; auto.
Qed.

Theorem Pdivless2 :
forall bound p length base,
Pcompare bound p Datatypes.Eq <> Datatypes.Gt ->
Pdivless bound p base length =
match Pdiv p base with
| (None, None) => (None _, None _, 1)
| (None, Some r1) => (None _, Some _ r1, 1)
| (Some q1, None) =>
match length with
| xH => (Some _ q1, None _, 0)
| xO length' =>
match Pdivless bound q1 base length' with
| (s2, None, n) => (s2, None _, S n)
| (s2, Some r2, n) =>
(s2,
Some _
((fun (x : positive)
(_ : positive -> positive)
(y : positive) => (x * y)%positive) r2 (
fun x => x) base), S n)
end
| xI length' =>
match Pdivless bound q1 base length' with
| (s2, None, n) => (s2, None _, S n)
| (s2, Some r2, n) =>
(s2,
Some _
((fun (x : positive)
(_ : positive -> positive)
(y : positive) => (x * y)%positive) r2 (
fun x => x) base), S n)
end
end
| (Some q1, Some r1) =>
match length with
| xH => (Some _ q1, None _, 0)
| xO length' =>
match Pdivless bound q1 base length' with
| (s2, None, n) => (s2, Some _ r1, S n)
| (s2, Some r2, n) =>
(s2,
Some _
((fun (x : positive)
(_ : positive -> positive)
(y : positive) => x * y) r2 (
fun x => x) base + r1)%positive,
S n)
end
| xI length' =>
match Pdivless bound q1 base length' with
| (s2, None, n) => (s2, Some _ r1, S n)
| (s2, Some r2, n) =>
(s2,
Some _
((fun (x : positive)
(_ : positive -> positive)
(y : positive) => x * y) r2 (
fun x => x) base + r1)%positive,
S n)
end
end
end.