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| Mirrors > Home > MPE Home > Th. List > brdomi | Structured version Visualization version GIF version | ||
| Description: Dominance relation. (Contributed by Mario Carneiro, 26-Apr-2015.) Avoid ax-un 7719. (Revised by BTernaryTau, 29-Nov-2024.) |
| Ref | Expression |
|---|---|
| brdomi | ⊢ (𝐴 ≼ 𝐵 → ∃𝑓 𝑓:𝐴–1-1→𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | reldom 8934 | . . . 4 ⊢ Rel ≼ | |
| 2 | 1 | brrelex12i 5703 | . . 3 ⊢ (𝐴 ≼ 𝐵 → (𝐴 ∈ V ∧ 𝐵 ∈ V)) |
| 3 | brdom2g 8939 | . . 3 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 ≼ 𝐵 ↔ ∃𝑓 𝑓:𝐴–1-1→𝐵)) | |
| 4 | 2, 3 | syl 17 | . 2 ⊢ (𝐴 ≼ 𝐵 → (𝐴 ≼ 𝐵 ↔ ∃𝑓 𝑓:𝐴–1-1→𝐵)) |
| 5 | 4 | ibi 269 | 1 ⊢ (𝐴 ≼ 𝐵 → ∃𝑓 𝑓:𝐴–1-1→𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 ∧ wa 399 ∃wex 1800 ∈ wcel 2143 Vcvv 3455 class class class wbr 5101 –1-1→wf1 6519 ≼ cdom 8926 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1816 ax-4 1830 ax-5 1931 ax-6 1988 ax-7 2029 ax-8 2145 ax-9 2153 ax-ext 2735 ax-sep 5247 ax-pr 5391 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1101 df-tru 1564 df-fal 1574 df-ex 1801 df-sb 2092 df-clab 2742 df-cleq 2755 df-clel 2838 df-ral 3078 df-rex 3088 df-rab 3416 df-v 3457 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4482 df-sn 4584 df-pr 4586 df-op 4590 df-br 5102 df-opab 5164 df-xp 5654 df-rel 5655 df-fn 6525 df-f 6526 df-f1 6527 df-dom 8930 |
| This theorem is referenced by: domssl 8980 domssr 8981 2dom 9012 undom 9038 xpdom2 9045 domunsncan 9050 dom0 9078 fodomr 9101 domssex 9111 domtrfil 9161 sucdom2 9172 sdom1 9195 1sdom2dom 9199 infn0 9247 fodomfir 9273 hartogslem1 9491 infdifsn 9613 acndom 10008 acndom2 10011 fictb 10201 fin23lem41 10310 iundom2g 10498 pwfseq 10623 omssubadd 34598 |
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