Step
*
of Lemma
monotone-bar-induction2
∀B,Q:n:ℕ ⟶ (ℕn ⟶ ℕ) ⟶ ℙ.
((∀n:ℕ. ∀s:ℕn ⟶ ℕ. (B[n;s]
⇒ (∀m:ℕ. B[n + 1;s.m@n])))
⇒ (∀n:ℕ. ∀s:ℕn ⟶ ℕ. (B[n;s]
⇒ ⇃(Q[n;s])))
⇒ (∀n:ℕ. ∀s:ℕn ⟶ ℕ. ((∀m:ℕ. ⇃(Q[n + 1;s.m@n]))
⇒ ⇃(Q[n;s])))
⇒ (∀alpha:ℕ ⟶ ℕ. ∃m:ℕ. B[m;alpha])
⇒ ⇃(Q[0;λx.⊥]))
BY
{ (Auto
THEN (Skolemize (-1) `F' THENA Auto)
THEN (InstLemma `strong-continuity2-no-inner-squash-bound` [⌜F⌝]⋅ THENA Auto)) }
1
1. B : n:ℕ ⟶ (ℕn ⟶ ℕ) ⟶ ℙ
2. Q : n:ℕ ⟶ (ℕn ⟶ ℕ) ⟶ ℙ
3. ∀n:ℕ. ∀s:ℕn ⟶ ℕ. (B[n;s]
⇒ (∀m:ℕ. B[n + 1;s.m@n]))
4. ∀n:ℕ. ∀s:ℕn ⟶ ℕ. (B[n;s]
⇒ ⇃(Q[n;s]))
5. ∀n:ℕ. ∀s:ℕn ⟶ ℕ. ((∀m:ℕ. ⇃(Q[n + 1;s.m@n]))
⇒ ⇃(Q[n;s]))
6. ∀alpha:ℕ ⟶ ℕ. ∃m:ℕ. B[m;alpha]
7. F : alpha:(ℕ ⟶ ℕ) ⟶ ℕ
8. ∀alpha:ℕ ⟶ ℕ. B[F alpha;alpha]
9. ⇃(∃M:n:ℕ ⟶ (ℕn ⟶ ℕ) ⟶ (ℕn?)
∀f:ℕ ⟶ ℕ
∃n:ℕ. (F f < n ∧ ((M n f) = (inl (F f)) ∈ (ℕ?)) ∧ (∀m:ℕ. ((↑isl(M m f))
⇒ ((M m f) = (inl (F f)) ∈ (ℕ?))))))
⊢ ⇃(Q[0;λx.⊥])
Latex:
Latex:
\mforall{}B,Q:n:\mBbbN{} {}\mrightarrow{} (\mBbbN{}n {}\mrightarrow{} \mBbbN{}) {}\mrightarrow{} \mBbbP{}.
((\mforall{}n:\mBbbN{}. \mforall{}s:\mBbbN{}n {}\mrightarrow{} \mBbbN{}. (B[n;s] {}\mRightarrow{} (\mforall{}m:\mBbbN{}. B[n + 1;s.m@n])))
{}\mRightarrow{} (\mforall{}n:\mBbbN{}. \mforall{}s:\mBbbN{}n {}\mrightarrow{} \mBbbN{}. (B[n;s] {}\mRightarrow{} \00D9(Q[n;s])))
{}\mRightarrow{} (\mforall{}n:\mBbbN{}. \mforall{}s:\mBbbN{}n {}\mrightarrow{} \mBbbN{}. ((\mforall{}m:\mBbbN{}. \00D9(Q[n + 1;s.m@n])) {}\mRightarrow{} \00D9(Q[n;s])))
{}\mRightarrow{} (\mforall{}alpha:\mBbbN{} {}\mrightarrow{} \mBbbN{}. \mexists{}m:\mBbbN{}. B[m;alpha])
{}\mRightarrow{} \00D9(Q[0;\mlambda{}x.\mbot{}]))
By
Latex:
(Auto
THEN (Skolemize (-1) `F' THENA Auto)
THEN (InstLemma `strong-continuity2-no-inner-squash-bound` [\mkleeneopen{}F\mkleeneclose{}]\mcdot{} THENA Auto))
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