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| Mirrors > Home > ILE Home > Th. List > brdomi | GIF version | ||
| Description: Dominance relation. (Contributed by Mario Carneiro, 26-Apr-2015.) |
| Ref | Expression |
|---|---|
| brdomi | ⊢ (𝐴 ≼ 𝐵 → ∃𝑓 𝑓:𝐴–1-1→𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | reldom 6832 | . . . 4 ⊢ Rel ≼ | |
| 2 | 1 | brrelex2i 4719 | . . 3 ⊢ (𝐴 ≼ 𝐵 → 𝐵 ∈ V) |
| 3 | brdomg 6837 | . . 3 ⊢ (𝐵 ∈ V → (𝐴 ≼ 𝐵 ↔ ∃𝑓 𝑓:𝐴–1-1→𝐵)) | |
| 4 | 2, 3 | syl 14 | . 2 ⊢ (𝐴 ≼ 𝐵 → (𝐴 ≼ 𝐵 ↔ ∃𝑓 𝑓:𝐴–1-1→𝐵)) |
| 5 | 4 | ibi 176 | 1 ⊢ (𝐴 ≼ 𝐵 → ∃𝑓 𝑓:𝐴–1-1→𝐵) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 ∃wex 1515 ∈ wcel 2176 Vcvv 2772 class class class wbr 4044 –1-1→wf1 5268 ≼ cdom 6826 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 711 ax-5 1470 ax-7 1471 ax-gen 1472 ax-ie1 1516 ax-ie2 1517 ax-8 1527 ax-10 1528 ax-11 1529 ax-i12 1530 ax-bndl 1532 ax-4 1533 ax-17 1549 ax-i9 1553 ax-ial 1557 ax-i5r 1558 ax-13 2178 ax-14 2179 ax-ext 2187 ax-sep 4162 ax-pow 4218 ax-pr 4253 ax-un 4480 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1484 df-sb 1786 df-eu 2057 df-mo 2058 df-clab 2192 df-cleq 2198 df-clel 2201 df-nfc 2337 df-ral 2489 df-rex 2490 df-v 2774 df-un 3170 df-in 3172 df-ss 3179 df-pw 3618 df-sn 3639 df-pr 3640 df-op 3642 df-uni 3851 df-br 4045 df-opab 4106 df-xp 4681 df-rel 4682 df-cnv 4683 df-dm 4685 df-rn 4686 df-fn 5274 df-f 5275 df-f1 5276 df-dom 6829 |
| This theorem is referenced by: domssr 6869 2dom 6897 xpdom2 6926 dom0 6935 isinfinf 6994 infm 7001 djudom 7195 difinfsn 7202 exmidfodomrlemim 7309 1dom1el 15927 domomsubct 15938 |
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