Step |
Hyp |
Ref |
Expression |
1 |
|
2str1.g |
⊢ 𝐺 = { ⟨ ( Base ‘ ndx ) , 𝐵 ⟩ , ⟨ 𝑁 , + ⟩ } |
2 |
|
2str1.b |
⊢ ( Base ‘ ndx ) < 𝑁 |
3 |
|
2str1.n |
⊢ 𝑁 ∈ ℕ |
4 |
|
2str1.e |
⊢ 𝐸 = Slot 𝑁 |
5 |
1 2 3
|
2strstr1 |
⊢ 𝐺 Struct ⟨ ( Base ‘ ndx ) , 𝑁 ⟩ |
6 |
4 3
|
ndxid |
⊢ 𝐸 = Slot ( 𝐸 ‘ ndx ) |
7 |
|
snsspr2 |
⊢ { ⟨ 𝑁 , + ⟩ } ⊆ { ⟨ ( Base ‘ ndx ) , 𝐵 ⟩ , ⟨ 𝑁 , + ⟩ } |
8 |
4 3
|
ndxarg |
⊢ ( 𝐸 ‘ ndx ) = 𝑁 |
9 |
8
|
opeq1i |
⊢ ⟨ ( 𝐸 ‘ ndx ) , + ⟩ = ⟨ 𝑁 , + ⟩ |
10 |
9
|
sneqi |
⊢ { ⟨ ( 𝐸 ‘ ndx ) , + ⟩ } = { ⟨ 𝑁 , + ⟩ } |
11 |
7 10 1
|
3sstr4i |
⊢ { ⟨ ( 𝐸 ‘ ndx ) , + ⟩ } ⊆ 𝐺 |
12 |
5 6 11
|
strfv |
⊢ ( + ∈ 𝑉 → + = ( 𝐸 ‘ 𝐺 ) ) |