Step
*
of Lemma
monotone-bar-induction8
∀Q:n:ℕ ⟶ (ℕn ⟶ ℕ) ⟶ ℙ
((∀n:ℕ. ∀s:ℕn ⟶ ℕ. ((∀m:ℕ. ⇃(Q[n + 1;s.m@n]))
⇒ ⇃(Q[n;s])))
⇒ (∀f:ℕ ⟶ ℕ. ⇃(∃n:ℕ. ∀m:{n...}. ⇃(Q[m;f])))
⇒ ⇃(Q[0;λx.⊥]))
BY
{ ((UnivCD THENA Auto)
THEN RenameVar `bar' (-1)
THEN (InstLemma `strong-continuity-rel` [⌜λf,n. ∀m:{n...}. ⇃(Q[m;f])⌝;⌜bar⌝]⋅ THENA Auto)
THEN (BLemma `prop-truncation-quot` THENA Auto)
THEN AllReduce) }
1
1. Q : n:ℕ ⟶ (ℕn ⟶ ℕ) ⟶ ℙ
2. ∀n:ℕ. ∀s:ℕn ⟶ ℕ. ((∀m:ℕ. ⇃(Q[n + 1;s.m@n]))
⇒ ⇃(Q[n;s]))
3. bar : ∀f:ℕ ⟶ ℕ. ⇃(∃n:ℕ. ∀m:{n...}. ⇃(Q[m;f]))
4. ⇃(∃M:n:ℕ ⟶ (ℕn ⟶ ℕ) ⟶ (ℕn?)
∀f:ℕ ⟶ ℕ
∃n:ℕ
∃k:ℕn
((∀m:{k...}. ⇃(Q[m;f])) ∧ ((M n f) = (inl k) ∈ (ℕ?)) ∧ (∀m:ℕ. ((↑isl(M m f))
⇒ ((M m f) = (inl k) ∈ (ℕ?))))))
⊢ ⇃(⇃(Q[0;λx.⊥]))
Latex:
Latex:
\mforall{}Q:n:\mBbbN{} {}\mrightarrow{} (\mBbbN{}n {}\mrightarrow{} \mBbbN{}) {}\mrightarrow{} \mBbbP{}
((\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{}f:\mBbbN{} {}\mrightarrow{} \mBbbN{}. \00D9(\mexists{}n:\mBbbN{}. \mforall{}m:\{n...\}. \00D9(Q[m;f])))
{}\mRightarrow{} \00D9(Q[0;\mlambda{}x.\mbot{}]))
By
Latex:
((UnivCD THENA Auto)
THEN RenameVar `bar' (-1)
THEN (InstLemma `strong-continuity-rel` [\mkleeneopen{}\mlambda{}f,n. \mforall{}m:\{n...\}. \00D9(Q[m;f])\mkleeneclose{};\mkleeneopen{}bar\mkleeneclose{}]\mcdot{} THENA Auto)
THEN (BLemma `prop-truncation-quot` THENA Auto)
THEN AllReduce)
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