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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 7761. (Revised by BTernaryTau, 29-Nov-2024.) |
| Ref | Expression |
|---|---|
| brdomi | ⊢ (𝐴 ≼ 𝐵 → ∃𝑓 𝑓:𝐴–1-1→𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | reldom 8993 | . . . 4 ⊢ Rel ≼ | |
| 2 | 1 | brrelex12i 5710 | . . 3 ⊢ (𝐴 ≼ 𝐵 → (𝐴 ∈ V ∧ 𝐵 ∈ V)) |
| 3 | brdom2g 8998 | . . 3 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 ≼ 𝐵 ↔ ∃𝑓 𝑓:𝐴–1-1→𝐵)) | |
| 4 | 2, 3 | syl 18 | . 2 ⊢ (𝐴 ≼ 𝐵 → (𝐴 ≼ 𝐵 ↔ ∃𝑓 𝑓:𝐴–1-1→𝐵)) |
| 5 | 4 | ibi 270 | 1 ⊢ (𝐴 ≼ 𝐵 → ∃𝑓 𝑓:𝐴–1-1→𝐵) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∃wex 1811 ∈ wcel 2146 Vcvv 3454 class class class wbr 5106 –1-1→wf1 6544 ≼ cdom 8985 |
| 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-ext 2735 ax-sep 5252 ax-pr 5395 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2101 df-clab 2742 df-cleq 2755 df-clel 2839 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4839 df-br 5107 df-opab 5171 df-xp 5661 df-rel 5662 df-fn 6550 df-f 6551 df-f1 6552 df-dom 8989 |
| This theorem is used by: domssl 9039 domssr 9040 2dom 9072 undom 9098 xpdom2 9105 domunsncan 9110 dom0 9138 fodomr 9161 domssex 9171 domtrfil 9221 sucdom2 9232 sdom1 9255 1sdom2dom 9259 infn0 9308 fodomfir 9333 hartogslem1 9549 infdifsn 9671 acndom 10143 acndom2 10146 fictb 10335 fin23lem41 10443 iundom2g 10637 pwfseq 10762 omssubadd 34988 |
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