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Mirrors > Home > MPE Home > Th. List > orduniorsuc | Structured version Visualization version GIF version |
Description: An ordinal class is either its union or the successor of its union. If we adopt the view that zero is a limit ordinal, this means every ordinal class is either a limit or a successor. (Contributed by NM, 13-Sep-2003.) |
Ref | Expression |
---|---|
orduniorsuc | ⊢ (Ord 𝐴 → (𝐴 = ∪ 𝐴 ∨ 𝐴 = suc ∪ 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orduniss 6279 | . . . . . 6 ⊢ (Ord 𝐴 → ∪ 𝐴 ⊆ 𝐴) | |
2 | orduni 7503 | . . . . . . . 8 ⊢ (Ord 𝐴 → Ord ∪ 𝐴) | |
3 | ordelssne 6212 | . . . . . . . 8 ⊢ ((Ord ∪ 𝐴 ∧ Ord 𝐴) → (∪ 𝐴 ∈ 𝐴 ↔ (∪ 𝐴 ⊆ 𝐴 ∧ ∪ 𝐴 ≠ 𝐴))) | |
4 | 2, 3 | mpancom 686 | . . . . . . 7 ⊢ (Ord 𝐴 → (∪ 𝐴 ∈ 𝐴 ↔ (∪ 𝐴 ⊆ 𝐴 ∧ ∪ 𝐴 ≠ 𝐴))) |
5 | 4 | biimprd 250 | . . . . . 6 ⊢ (Ord 𝐴 → ((∪ 𝐴 ⊆ 𝐴 ∧ ∪ 𝐴 ≠ 𝐴) → ∪ 𝐴 ∈ 𝐴)) |
6 | 1, 5 | mpand 693 | . . . . 5 ⊢ (Ord 𝐴 → (∪ 𝐴 ≠ 𝐴 → ∪ 𝐴 ∈ 𝐴)) |
7 | ordsucss 7527 | . . . . 5 ⊢ (Ord 𝐴 → (∪ 𝐴 ∈ 𝐴 → suc ∪ 𝐴 ⊆ 𝐴)) | |
8 | 6, 7 | syld 47 | . . . 4 ⊢ (Ord 𝐴 → (∪ 𝐴 ≠ 𝐴 → suc ∪ 𝐴 ⊆ 𝐴)) |
9 | ordsucuni 7538 | . . . 4 ⊢ (Ord 𝐴 → 𝐴 ⊆ suc ∪ 𝐴) | |
10 | 8, 9 | jctild 528 | . . 3 ⊢ (Ord 𝐴 → (∪ 𝐴 ≠ 𝐴 → (𝐴 ⊆ suc ∪ 𝐴 ∧ suc ∪ 𝐴 ⊆ 𝐴))) |
11 | df-ne 3017 | . . . 4 ⊢ (𝐴 ≠ ∪ 𝐴 ↔ ¬ 𝐴 = ∪ 𝐴) | |
12 | necom 3069 | . . . 4 ⊢ (𝐴 ≠ ∪ 𝐴 ↔ ∪ 𝐴 ≠ 𝐴) | |
13 | 11, 12 | bitr3i 279 | . . 3 ⊢ (¬ 𝐴 = ∪ 𝐴 ↔ ∪ 𝐴 ≠ 𝐴) |
14 | eqss 3981 | . . 3 ⊢ (𝐴 = suc ∪ 𝐴 ↔ (𝐴 ⊆ suc ∪ 𝐴 ∧ suc ∪ 𝐴 ⊆ 𝐴)) | |
15 | 10, 13, 14 | 3imtr4g 298 | . 2 ⊢ (Ord 𝐴 → (¬ 𝐴 = ∪ 𝐴 → 𝐴 = suc ∪ 𝐴)) |
16 | 15 | orrd 859 | 1 ⊢ (Ord 𝐴 → (𝐴 = ∪ 𝐴 ∨ 𝐴 = suc ∪ 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∧ wa 398 ∨ wo 843 = wceq 1533 ∈ wcel 2110 ≠ wne 3016 ⊆ wss 3935 ∪ cuni 4831 Ord word 6184 suc csuc 6187 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pr 5321 ax-un 7455 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-sbc 3772 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-br 5059 df-opab 5121 df-tr 5165 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-we 5510 df-ord 6188 df-on 6189 df-suc 6191 |
This theorem is referenced by: onuniorsuci 7548 oeeulem 8221 cantnfp1lem2 9136 cantnflem1 9146 cnfcom2lem 9158 dfac12lem1 9563 dfac12lem2 9564 ttukeylem3 9927 ttukeylem5 9929 ttukeylem6 9930 ordtoplem 33778 ordcmp 33790 onsucuni3 34642 aomclem5 39651 onsetreclem3 44803 |
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