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| Mirrors > Home > MPE Home > Th. List > ordtri1 | Structured version Visualization version GIF version | ||
| Description: A trichotomy law for ordinals. (Contributed by NM, 25-Mar-1995.) (Proof shortened by Andrew Salmon, 25-Jul-2011.) |
| Ref | Expression |
|---|---|
| ordtri1 | ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴 ⊆ 𝐵 ↔ ¬ 𝐵 ∈ 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ordsseleq 6354 | . 2 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴 ⊆ 𝐵 ↔ (𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵))) | |
| 2 | ordn2lp 6345 | . . . . 5 ⊢ (Ord 𝐴 → ¬ (𝐴 ∈ 𝐵 ∧ 𝐵 ∈ 𝐴)) | |
| 3 | imnan 399 | . . . . 5 ⊢ ((𝐴 ∈ 𝐵 → ¬ 𝐵 ∈ 𝐴) ↔ ¬ (𝐴 ∈ 𝐵 ∧ 𝐵 ∈ 𝐴)) | |
| 4 | 2, 3 | sylibr 234 | . . . 4 ⊢ (Ord 𝐴 → (𝐴 ∈ 𝐵 → ¬ 𝐵 ∈ 𝐴)) |
| 5 | ordirr 6343 | . . . . 5 ⊢ (Ord 𝐵 → ¬ 𝐵 ∈ 𝐵) | |
| 6 | eleq2 2826 | . . . . . 6 ⊢ (𝐴 = 𝐵 → (𝐵 ∈ 𝐴 ↔ 𝐵 ∈ 𝐵)) | |
| 7 | 6 | notbid 318 | . . . . 5 ⊢ (𝐴 = 𝐵 → (¬ 𝐵 ∈ 𝐴 ↔ ¬ 𝐵 ∈ 𝐵)) |
| 8 | 5, 7 | syl5ibrcom 247 | . . . 4 ⊢ (Ord 𝐵 → (𝐴 = 𝐵 → ¬ 𝐵 ∈ 𝐴)) |
| 9 | 4, 8 | jaao 957 | . . 3 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → ((𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵) → ¬ 𝐵 ∈ 𝐴)) |
| 10 | ordtri3or 6357 | . . . . . 6 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵 ∨ 𝐵 ∈ 𝐴)) | |
| 11 | df-3or 1088 | . . . . . 6 ⊢ ((𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵 ∨ 𝐵 ∈ 𝐴) ↔ ((𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵) ∨ 𝐵 ∈ 𝐴)) | |
| 12 | 10, 11 | sylib 218 | . . . . 5 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → ((𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵) ∨ 𝐵 ∈ 𝐴)) |
| 13 | 12 | orcomd 872 | . . . 4 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐵 ∈ 𝐴 ∨ (𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵))) |
| 14 | 13 | ord 865 | . . 3 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (¬ 𝐵 ∈ 𝐴 → (𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵))) |
| 15 | 9, 14 | impbid 212 | . 2 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → ((𝐴 ∈ 𝐵 ∨ 𝐴 = 𝐵) ↔ ¬ 𝐵 ∈ 𝐴)) |
| 16 | 1, 15 | bitrd 279 | 1 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴 ⊆ 𝐵 ↔ ¬ 𝐵 ∈ 𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 ∨ wo 848 ∨ w3o 1086 = wceq 1542 ∈ wcel 2114 ⊆ wss 3903 Ord word 6324 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-sep 5243 ax-pr 5379 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3402 df-v 3444 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-tr 5208 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-ord 6328 |
| This theorem is referenced by: ontri1 6359 ordtri2 6360 ordtri4 6362 ordtr3 6371 ordintdif 6376 ordtri2or 6425 ordsucss 7770 ordsucsssuc 7775 ordsucuniel 7776 limsssuc 7802 ssnlim 7838 smoword 8308 tfrlem15 8333 nnaword 8565 nnawordex 8575 eldifsucnn 8602 nndomog 9149 onomeneq 9150 isfinite2 9210 unfilem1 9217 tfsnfin2 9275 wofib 9462 cantnflem1 9610 ttrcltr 9637 dmttrcl 9642 alephgeom 10004 alephdom2 10009 cflim2 10185 fin67 10317 winainflem 10616 finminlem 36534 ordeldif 43615 ordeldifsucon 43616 ordeldif1o 43617 |
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