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| Mirrors > Home > MPE Home > Th. List > sucdom | Structured version Visualization version GIF version | ||
| Description: Strict dominance of a set over a natural number is the same as dominance over its successor. (Contributed by Mario Carneiro, 12-Jan-2013.) Avoid ax-pow 5330. (Revised by BTernaryTau, 4-Dec-2024.) (Proof shortened by BJ, 11-Jan-2025.) |
| Ref | Expression |
|---|---|
| sucdom | ⊢ (𝐴 ∈ ω → (𝐴 ≺ 𝐵 ↔ suc 𝐴 ≼ 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sucdom2 9229 | . 2 ⊢ (𝐴 ≺ 𝐵 → suc 𝐴 ≼ 𝐵) | |
| 2 | nnfi 9194 | . . 3 ⊢ (𝐴 ∈ ω → 𝐴 ∈ Fin) | |
| 3 | php4 9236 | . . 3 ⊢ (𝐴 ∈ ω → 𝐴 ≺ suc 𝐴) | |
| 4 | sdomdomtrfi 9227 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ≺ suc 𝐴 ∧ suc 𝐴 ≼ 𝐵) → 𝐴 ≺ 𝐵) | |
| 5 | 4 | 3expia 1139 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ≺ suc 𝐴) → (suc 𝐴 ≼ 𝐵 → 𝐴 ≺ 𝐵)) |
| 6 | 2, 3, 5 | syl2anc 596 | . 2 ⊢ (𝐴 ∈ ω → (suc 𝐴 ≼ 𝐵 → 𝐴 ≺ 𝐵)) |
| 7 | 1, 6 | impbid2 229 | 1 ⊢ (𝐴 ∈ ω → (𝐴 ≺ 𝐵 ↔ suc 𝐴 ≼ 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∈ wcel 2146 class class class wbr 5105 suc csuc 6370 ωcom 7884 ≼ cdom 8982 ≺ csdm 8983 Fincfn 8984 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2196 ax-12 2215 ax-ext 2735 ax-sep 5251 ax-nul 5262 ax-pr 5394 ax-un 7758 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2101 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-reu 3369 df-rab 3416 df-v 3455 df-sbc 3742 df-csb 3851 df-ss 3900 df-pss 4016 df-dif 4049 df-in 4093 df-un 4153 df-nul 4281 df-if 4485 df-pw 4561 df-sn 4588 df-pr 4590 df-op 4838 df-uni 4870 df-br 5106 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5549 df-eprel 5554 df-po 5562 df-so 5563 df-fr 5607 df-we 5609 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-ord 6371 df-on 6372 df-lim 6373 df-suc 6374 df-iota 6500 df-fun 6548 df-fn 6549 df-f 6550 df-f1 6551 df-fo 6552 df-f1o 6553 df-fv 6554 df-om 7885 df-1o 8487 df-en 8985 df-dom 8986 df-sdom 8987 df-fin 8988 |
| This theorem is used by: 0sdom1domALT 9249 harsucnn 10089 isnzr2 20780 |
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