| Step | Hyp | Ref
 | Expression | 
| 1 |   | funres 5299 | 
. . . . 5
⊢ (Fun
(𝐺 ∖ {∅})
→ Fun ((𝐺 ∖
{∅}) ↾ (V ∖ dom {〈𝐼, 𝐸〉}))) | 
| 2 | 1 | ad2antlr 489 | 
. . . 4
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → Fun ((𝐺 ∖ {∅}) ↾ (V ∖ dom
{〈𝐼, 𝐸〉}))) | 
| 3 |   | funsng 5304 | 
. . . . 5
⊢ ((𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊) → Fun {〈𝐼, 𝐸〉}) | 
| 4 | 3 | adantl 277 | 
. . . 4
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → Fun {〈𝐼, 𝐸〉}) | 
| 5 |   | dmres 4967 | 
. . . . . . 7
⊢ dom
((𝐺 ∖ {∅})
↾ (V ∖ dom {〈𝐼, 𝐸〉})) = ((V ∖ dom {〈𝐼, 𝐸〉}) ∩ dom (𝐺 ∖ {∅})) | 
| 6 | 5 | ineq1i 3360 | 
. . . . . 6
⊢ (dom
((𝐺 ∖ {∅})
↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∩ dom {〈𝐼, 𝐸〉}) = (((V ∖ dom {〈𝐼, 𝐸〉}) ∩ dom (𝐺 ∖ {∅})) ∩ dom {〈𝐼, 𝐸〉}) | 
| 7 |   | in32 3375 | 
. . . . . . 7
⊢ (((V
∖ dom {〈𝐼, 𝐸〉}) ∩ dom (𝐺 ∖ {∅})) ∩ dom
{〈𝐼, 𝐸〉}) = (((V ∖ dom {〈𝐼, 𝐸〉}) ∩ dom {〈𝐼, 𝐸〉}) ∩ dom (𝐺 ∖ {∅})) | 
| 8 |   | incom 3355 | 
. . . . . . . . 9
⊢ ((V
∖ dom {〈𝐼, 𝐸〉}) ∩ dom {〈𝐼, 𝐸〉}) = (dom {〈𝐼, 𝐸〉} ∩ (V ∖ dom {〈𝐼, 𝐸〉})) | 
| 9 |   | disjdif 3523 | 
. . . . . . . . 9
⊢ (dom
{〈𝐼, 𝐸〉} ∩ (V ∖ dom {〈𝐼, 𝐸〉})) = ∅ | 
| 10 | 8, 9 | eqtri 2217 | 
. . . . . . . 8
⊢ ((V
∖ dom {〈𝐼, 𝐸〉}) ∩ dom {〈𝐼, 𝐸〉}) = ∅ | 
| 11 | 10 | ineq1i 3360 | 
. . . . . . 7
⊢ (((V
∖ dom {〈𝐼, 𝐸〉}) ∩ dom {〈𝐼, 𝐸〉}) ∩ dom (𝐺 ∖ {∅})) = (∅ ∩ dom
(𝐺 ∖
{∅})) | 
| 12 |   | 0in 3486 | 
. . . . . . 7
⊢ (∅
∩ dom (𝐺 ∖
{∅})) = ∅ | 
| 13 | 7, 11, 12 | 3eqtri 2221 | 
. . . . . 6
⊢ (((V
∖ dom {〈𝐼, 𝐸〉}) ∩ dom (𝐺 ∖ {∅})) ∩ dom
{〈𝐼, 𝐸〉}) = ∅ | 
| 14 | 6, 13 | eqtri 2217 | 
. . . . 5
⊢ (dom
((𝐺 ∖ {∅})
↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∩ dom {〈𝐼, 𝐸〉}) = ∅ | 
| 15 | 14 | a1i 9 | 
. . . 4
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → (dom ((𝐺 ∖ {∅}) ↾ (V ∖ dom
{〈𝐼, 𝐸〉})) ∩ dom {〈𝐼, 𝐸〉}) = ∅) | 
| 16 |   | funun 5302 | 
. . . 4
⊢ (((Fun
((𝐺 ∖ {∅})
↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∧ Fun {〈𝐼, 𝐸〉}) ∧ (dom ((𝐺 ∖ {∅}) ↾ (V ∖ dom
{〈𝐼, 𝐸〉})) ∩ dom {〈𝐼, 𝐸〉}) = ∅) → Fun (((𝐺 ∖ {∅}) ↾ (V
∖ dom {〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉})) | 
| 17 | 2, 4, 15, 16 | syl21anc 1248 | 
. . 3
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → Fun (((𝐺 ∖ {∅}) ↾ (V ∖ dom
{〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉})) | 
| 18 |   | difundir 3416 | 
. . . . 5
⊢ (((𝐺 ↾ (V ∖ dom
{〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉}) ∖ {∅}) = (((𝐺 ↾ (V ∖ dom
{〈𝐼, 𝐸〉})) ∖ {∅}) ∪
({〈𝐼, 𝐸〉} ∖
{∅})) | 
| 19 |   | resdifcom 4964 | 
. . . . . . 7
⊢ ((𝐺 ↾ (V ∖ dom
{〈𝐼, 𝐸〉})) ∖ {∅}) = ((𝐺 ∖ {∅}) ↾ (V
∖ dom {〈𝐼, 𝐸〉})) | 
| 20 | 19 | a1i 9 | 
. . . . . 6
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → ((𝐺 ↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∖ {∅}) = ((𝐺 ∖ {∅}) ↾ (V
∖ dom {〈𝐼, 𝐸〉}))) | 
| 21 |   | elex 2774 | 
. . . . . . . . 9
⊢ (𝐼 ∈ 𝑈 → 𝐼 ∈ V) | 
| 22 |   | elex 2774 | 
. . . . . . . . 9
⊢ (𝐸 ∈ 𝑊 → 𝐸 ∈ V) | 
| 23 |   | opm 4267 | 
. . . . . . . . . 10
⊢
(∃𝑥 𝑥 ∈ 〈𝐼, 𝐸〉 ↔ (𝐼 ∈ V ∧ 𝐸 ∈ V)) | 
| 24 |   | n0r 3464 | 
. . . . . . . . . 10
⊢
(∃𝑥 𝑥 ∈ 〈𝐼, 𝐸〉 → 〈𝐼, 𝐸〉 ≠ ∅) | 
| 25 | 23, 24 | sylbir 135 | 
. . . . . . . . 9
⊢ ((𝐼 ∈ V ∧ 𝐸 ∈ V) → 〈𝐼, 𝐸〉 ≠ ∅) | 
| 26 | 21, 22, 25 | syl2an 289 | 
. . . . . . . 8
⊢ ((𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊) → 〈𝐼, 𝐸〉 ≠ ∅) | 
| 27 | 26 | adantl 277 | 
. . . . . . 7
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → 〈𝐼, 𝐸〉 ≠ ∅) | 
| 28 |   | disjsn2 3685 | 
. . . . . . 7
⊢
(〈𝐼, 𝐸〉 ≠ ∅ →
({〈𝐼, 𝐸〉} ∩ {∅}) =
∅) | 
| 29 |   | disjdif2 3529 | 
. . . . . . 7
⊢
(({〈𝐼, 𝐸〉} ∩ {∅}) =
∅ → ({〈𝐼,
𝐸〉} ∖ {∅})
= {〈𝐼, 𝐸〉}) | 
| 30 | 27, 28, 29 | 3syl 17 | 
. . . . . 6
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → ({〈𝐼, 𝐸〉} ∖ {∅}) = {〈𝐼, 𝐸〉}) | 
| 31 | 20, 30 | uneq12d 3318 | 
. . . . 5
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → (((𝐺 ↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∖ {∅}) ∪
({〈𝐼, 𝐸〉} ∖ {∅})) =
(((𝐺 ∖ {∅})
↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉})) | 
| 32 | 18, 31 | eqtrid 2241 | 
. . . 4
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → (((𝐺 ↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉}) ∖ {∅}) = (((𝐺 ∖ {∅}) ↾ (V
∖ dom {〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉})) | 
| 33 | 32 | funeqd 5280 | 
. . 3
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → (Fun (((𝐺 ↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉}) ∖ {∅}) ↔ Fun
(((𝐺 ∖ {∅})
↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉}))) | 
| 34 | 17, 33 | mpbird 167 | 
. 2
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → Fun (((𝐺 ↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉}) ∖
{∅})) | 
| 35 |   | simpll 527 | 
. . . . 5
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → 𝐺 ∈ 𝑉) | 
| 36 |   | opexg 4261 | 
. . . . . 6
⊢ ((𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊) → 〈𝐼, 𝐸〉 ∈ V) | 
| 37 | 36 | adantl 277 | 
. . . . 5
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → 〈𝐼, 𝐸〉 ∈ V) | 
| 38 |   | setsvalg 12708 | 
. . . . 5
⊢ ((𝐺 ∈ 𝑉 ∧ 〈𝐼, 𝐸〉 ∈ V) → (𝐺 sSet 〈𝐼, 𝐸〉) = ((𝐺 ↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉})) | 
| 39 | 35, 37, 38 | syl2anc 411 | 
. . . 4
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → (𝐺 sSet 〈𝐼, 𝐸〉) = ((𝐺 ↾ (V ∖ dom {〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉})) | 
| 40 | 39 | difeq1d 3280 | 
. . 3
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → ((𝐺 sSet 〈𝐼, 𝐸〉) ∖ {∅}) = (((𝐺 ↾ (V ∖ dom
{〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉}) ∖
{∅})) | 
| 41 | 40 | funeqd 5280 | 
. 2
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → (Fun ((𝐺 sSet 〈𝐼, 𝐸〉) ∖ {∅}) ↔ Fun
(((𝐺 ↾ (V ∖ dom
{〈𝐼, 𝐸〉})) ∪ {〈𝐼, 𝐸〉}) ∖
{∅}))) | 
| 42 | 34, 41 | mpbird 167 | 
1
⊢ (((𝐺 ∈ 𝑉 ∧ Fun (𝐺 ∖ {∅})) ∧ (𝐼 ∈ 𝑈 ∧ 𝐸 ∈ 𝑊)) → Fun ((𝐺 sSet 〈𝐼, 𝐸〉) ∖ {∅})) |