Step
*
1
1
of Lemma
rank-Ex1_wf
.....wf.....
1. T : Type
2. t1 : RankEx1(T) List
3. ∀i:ℕ||t1||. (rank-Ex1(t1[i]) ∈ ℕ)
⊢ map(λu.rank-Ex1(u);t1) ∈ ℤ List
BY
{ SubsumeC ⌈ℕ List⌉⋅ }
1
1. T : Type
2. t1 : RankEx1(T) List
3. ∀i:ℕ||t1||. (rank-Ex1(t1[i]) ∈ ℕ)
⊢ map(λu.rank-Ex1(u);t1) ∈ ℕ List
2
1. T : Type
2. t1 : RankEx1(T) List
3. ∀i:ℕ||t1||. (rank-Ex1(t1[i]) ∈ ℕ)
4. map(λu.rank-Ex1(u);t1) = map(λu.rank-Ex1(u);t1) ∈ (ℕ List)
⊢ (ℕ List) ⊆r (ℤ List)
Latex:
.....wf.....
1. T : Type
2. t1 : RankEx1(T) List
3. \mforall{}i:\mBbbN{}||t1||. (rank-Ex1(t1[i]) \mmember{} \mBbbN{})
\mvdash{} map(\mlambda{}u.rank-Ex1(u);t1) \mmember{} \mBbbZ{} List
By
SubsumeC \mkleeneopen{}\mBbbN{} List\mkleeneclose{}\mcdot{}
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