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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 6632 | . . . 4 ⊢ Rel ≼ | |
2 | 1 | brrelex2i 4578 | . . 3 ⊢ (𝐴 ≼ 𝐵 → 𝐵 ∈ V) |
3 | brdomg 6635 | . . 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 175 | 1 ⊢ (𝐴 ≼ 𝐵 → ∃𝑓 𝑓:𝐴–1-1→𝐵) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 104 ∃wex 1468 ∈ wcel 1480 Vcvv 2681 class class class wbr 3924 –1-1→wf1 5115 ≼ cdom 6626 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 ax-un 4350 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-rex 2420 df-v 2683 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-br 3925 df-opab 3985 df-xp 4540 df-rel 4541 df-cnv 4542 df-dm 4544 df-rn 4545 df-fn 5121 df-f 5122 df-f1 5123 df-dom 6629 |
This theorem is referenced by: 2dom 6692 xpdom2 6718 dom0 6725 isinfinf 6784 infm 6791 djudom 6971 difinfsn 6978 exmidfodomrlemim 7050 |
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