Proof of Theorem nlimsuc
| Step | Hyp | Ref
| Expression |
| 1 | | ordsuc 2318 |
. . . . 5
⊢ (Ord A
↔ Ord suc A) |
| 2 | | ordeirr 2217 |
. . . . 5
⊢ (Ord suc A → ¬ suc A ∈ suc A) |
| 3 | 1, 2 | sylbi 174 |
. . . 4
⊢ (Ord A
→ ¬ suc A ∈ suc A) |
| 4 | | eleq1 1149 |
. . . . . 6
⊢ (suc A
= ∪suc A →
(suc A ∈ suc A ↔ ∪suc A ∈ suc A)) |
| 5 | | nlimsuc.1 |
. . . . . . . 8
⊢ A
∈ V |
| 6 | 5 | sucid 2304 |
. . . . . . 7
⊢ A
∈ suc A |
| 7 | | ordtr 2213 |
. . . . . . . . 9
⊢ (Ord A
→ Tr A) |
| 8 | 5 | unisuc 2299 |
. . . . . . . . 9
⊢ (Tr A
↔ ∪suc A =
A) |
| 9 | 7, 8 | sylib 173 |
. . . . . . . 8
⊢ (Ord A
→ ∪suc A =
A) |
| 10 | 9 | eleq1d 1155 |
. . . . . . 7
⊢ (Ord A
→ (∪suc A
∈ suc A ↔ A ∈ suc A)) |
| 11 | 6, 10 | mpbiri 169 |
. . . . . 6
⊢ (Ord A
→ ∪suc A
∈ suc A) |
| 12 | 4, 11 | syl5bir 184 |
. . . . 5
⊢ (suc A
= ∪suc A →
(Ord A → suc A ∈ suc A)) |
| 13 | 12 | com12 13 |
. . . 4
⊢ (Ord A
→ (suc A = ∪suc A → suc
A ∈ suc A)) |
| 14 | 3, 13 | mtod 95 |
. . 3
⊢ (Ord A
→ ¬ suc A = ∪suc A) |
| 15 | | limuni 2284 |
. . 3
⊢ (Lim suc A → suc A =
∪suc A) |
| 16 | 14, 15 | nsyl 102 |
. 2
⊢ (Ord A
→ ¬ Lim suc A) |
| 17 | | 3simp1 594 |
. . . 4
⊢ ((Ord suc A ∧ ¬ suc A = ∅ ∧ suc A = ∪suc A) → Ord suc A) |
| 18 | | df-lim 2204 |
. . . 4
⊢ (Lim suc A ↔ (Ord suc A ∧ ¬ suc A = ∅ ∧ suc A = ∪suc A)) |
| 19 | 17, 18, 1 | 3imtr4 192 |
. . 3
⊢ (Lim suc A → Ord A) |
| 20 | 19 | con3i 90 |
. 2
⊢ (¬ Ord A → ¬ Lim suc A) |
| 21 | 16, 20 | pm2.61i 110 |
1
⊢ ¬ Lim suc A |