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Mirrors > Home > MPE Home > Th. List > ordsucsssuc | Structured version Visualization version GIF version |
Description: The subclass relationship between two ordinal classes is inherited by their successors. (Contributed by NM, 4-Oct-2003.) |
Ref | Expression |
---|---|
ordsucsssuc | ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴 ⊆ 𝐵 ↔ suc 𝐴 ⊆ suc 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ordsucelsuc 7302 | . . . 4 ⊢ (Ord 𝐴 → (𝐵 ∈ 𝐴 ↔ suc 𝐵 ∈ suc 𝐴)) | |
2 | 1 | notbid 310 | . . 3 ⊢ (Ord 𝐴 → (¬ 𝐵 ∈ 𝐴 ↔ ¬ suc 𝐵 ∈ suc 𝐴)) |
3 | 2 | adantr 474 | . 2 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (¬ 𝐵 ∈ 𝐴 ↔ ¬ suc 𝐵 ∈ suc 𝐴)) |
4 | ordtri1 6011 | . 2 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴 ⊆ 𝐵 ↔ ¬ 𝐵 ∈ 𝐴)) | |
5 | ordsuc 7294 | . . 3 ⊢ (Ord 𝐴 ↔ Ord suc 𝐴) | |
6 | ordsuc 7294 | . . 3 ⊢ (Ord 𝐵 ↔ Ord suc 𝐵) | |
7 | ordtri1 6011 | . . 3 ⊢ ((Ord suc 𝐴 ∧ Ord suc 𝐵) → (suc 𝐴 ⊆ suc 𝐵 ↔ ¬ suc 𝐵 ∈ suc 𝐴)) | |
8 | 5, 6, 7 | syl2anb 591 | . 2 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (suc 𝐴 ⊆ suc 𝐵 ↔ ¬ suc 𝐵 ∈ suc 𝐴)) |
9 | 3, 4, 8 | 3bitr4d 303 | 1 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴 ⊆ 𝐵 ↔ suc 𝐴 ⊆ suc 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 198 ∧ wa 386 ∈ wcel 2107 ⊆ wss 3792 Ord word 5977 suc csuc 5980 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1839 ax-4 1853 ax-5 1953 ax-6 2021 ax-7 2055 ax-8 2109 ax-9 2116 ax-10 2135 ax-11 2150 ax-12 2163 ax-13 2334 ax-ext 2754 ax-sep 5019 ax-nul 5027 ax-pr 5140 ax-un 7228 |
This theorem depends on definitions: df-bi 199 df-an 387 df-or 837 df-3or 1072 df-3an 1073 df-tru 1605 df-ex 1824 df-nf 1828 df-sb 2012 df-mo 2551 df-eu 2587 df-clab 2764 df-cleq 2770 df-clel 2774 df-nfc 2921 df-ne 2970 df-ral 3095 df-rex 3096 df-rab 3099 df-v 3400 df-sbc 3653 df-dif 3795 df-un 3797 df-in 3799 df-ss 3806 df-pss 3808 df-nul 4142 df-if 4308 df-sn 4399 df-pr 4401 df-tp 4403 df-op 4405 df-uni 4674 df-br 4889 df-opab 4951 df-tr 4990 df-eprel 5268 df-po 5276 df-so 5277 df-fr 5316 df-we 5318 df-ord 5981 df-on 5982 df-suc 5984 |
This theorem is referenced by: oawordri 7916 oeworde 7959 nnawordi 7987 bndrank 9003 rankmapu 9040 ackbij1b 9398 nosupbday 32448 onsuct0 33031 finxpsuclem 33836 |
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