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Related theorems GIF version |
| Description: A trichotomy law for ordinals. |
| Ref | Expression |
|---|---|
| ordtri4 | ⊢ ((Ord A ∧ Ord B) → (A = B ↔ (A ⊆ B ∧ ¬ A ∈ B))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ordtri3 2234 | . 2 ⊢ ((Ord A ∧ Ord B) → (A = B ↔ ¬ (A ∈ B ∨ B ∈ A))) | |
| 2 | ordtri1 2231 | . . . 4 ⊢ ((Ord A ∧ Ord B) → (A ⊆ B ↔ ¬ B ∈ A)) | |
| 3 | 2 | anbi1d 469 | . . 3 ⊢ ((Ord A ∧ Ord B) → ((A ⊆ B ∧ ¬ A ∈ B) ↔ (¬ B ∈ A ∧ ¬ A ∈ B))) |
| 4 | ancom 333 | . . . 4 ⊢ ((¬ B ∈ A ∧ ¬ A ∈ B) ↔ (¬ A ∈ B ∧ ¬ B ∈ A)) | |
| 5 | ioran 254 | . . . 4 ⊢ (¬ (A ∈ B ∨ B ∈ A) ↔ (¬ A ∈ B ∧ ¬ B ∈ A)) | |
| 6 | 4, 5 | bitr4 154 | . . 3 ⊢ ((¬ B ∈ A ∧ ¬ A ∈ B) ↔ ¬ (A ∈ B ∨ B ∈ A)) |
| 7 | 3, 6 | syl6bb 414 | . 2 ⊢ ((Ord A ∧ Ord B) → ((A ⊆ B ∧ ¬ A ∈ B) ↔ ¬ (A ∈ B ∨ B ∈ A))) |
| 8 | 1, 7 | bitr4d 409 | 1 ⊢ ((Ord A ∧ Ord B) → (A = B ↔ (A ⊆ B ∧ ¬ A ∈ B))) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 1 → wi 2 ↔ wb 127 ∨ wo 195 ∧ wa 196 = wceq 1091 ∈ wcel 1092 ⊆ wss 1487 Ord word 2198 |
| This theorem is referenced by: carduni 3664 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-3or 582 df-3an 583 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-ral 1205 df-rex 1206 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-uni 1920 df-tr 2042 df-br 2063 df-opab 2098 df-eprel 2122 df-po 2128 df-so 2138 df-fr 2169 df-we 2186 df-ord 2202 |