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| Mirrors > Home > MPE Home > Th. List > ssctOLD | Structured version Visualization version GIF version | ||
| Description: Obsolete version of ssct 9072 as of 7-Dec-2024. (Contributed by Thierry Arnoux, 31-Jan-2017.) (Proof modification is discouraged.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| ssctOLD | ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ≼ ω) → 𝐴 ≼ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ctex 8985 | . . . 4 ⊢ (𝐵 ≼ ω → 𝐵 ∈ V) | |
| 2 | ssdomg 9021 | . . . 4 ⊢ (𝐵 ∈ V → (𝐴 ⊆ 𝐵 → 𝐴 ≼ 𝐵)) | |
| 3 | 1, 2 | syl 17 | . . 3 ⊢ (𝐵 ≼ ω → (𝐴 ⊆ 𝐵 → 𝐴 ≼ 𝐵)) |
| 4 | 3 | impcom 407 | . 2 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ≼ ω) → 𝐴 ≼ 𝐵) |
| 5 | domtr 9028 | . 2 ⊢ ((𝐴 ≼ 𝐵 ∧ 𝐵 ≼ ω) → 𝐴 ≼ ω) | |
| 6 | 4, 5 | sylancom 588 | 1 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ≼ ω) → 𝐴 ≼ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2107 Vcvv 3463 ⊆ wss 3931 class class class wbr 5123 ωcom 7868 ≼ cdom 8964 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2706 ax-sep 5276 ax-nul 5286 ax-pow 5345 ax-pr 5412 ax-un 7736 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2064 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2808 df-nfc 2884 df-ral 3051 df-rex 3060 df-rab 3420 df-v 3465 df-dif 3934 df-un 3936 df-in 3938 df-ss 3948 df-nul 4314 df-if 4506 df-pw 4582 df-sn 4607 df-pr 4609 df-op 4613 df-uni 4888 df-br 5124 df-opab 5186 df-id 5558 df-xp 5671 df-rel 5672 df-cnv 5673 df-co 5674 df-dm 5675 df-rn 5676 df-res 5677 df-ima 5678 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-dom 8968 |
| This theorem is referenced by: (None) |
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