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Theorem brdomi 8894
Description: Dominance relation. (Contributed by Mario Carneiro, 26-Apr-2015.) Avoid ax-un 7678. (Revised by BTernaryTau, 29-Nov-2024.)
Assertion
Ref Expression
brdomi (𝐴𝐵 → ∃𝑓 𝑓:𝐴1-1𝐵)
Distinct variable groups:   𝐴,𝑓   𝐵,𝑓

Proof of Theorem brdomi
StepHypRef Expression
1 reldom 8887 . . . 4 Rel ≼
21brrelex12i 5677 . . 3 (𝐴𝐵 → (𝐴 ∈ V ∧ 𝐵 ∈ V))
3 brdom2g 8892 . . 3 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴𝐵 ↔ ∃𝑓 𝑓:𝐴1-1𝐵))
42, 3syl 17 . 2 (𝐴𝐵 → (𝐴𝐵 ↔ ∃𝑓 𝑓:𝐴1-1𝐵))
54ibi 267 1 (𝐴𝐵 → ∃𝑓 𝑓:𝐴1-1𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  wex 1780  wcel 2113  Vcvv 3438   class class class wbr 5096  1-1wf1 6487  cdom 8879
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-ext 2706  ax-sep 5239  ax-nul 5249  ax-pr 5375
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-clab 2713  df-cleq 2726  df-clel 2809  df-ral 3050  df-rex 3059  df-rab 3398  df-v 3440  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4284  df-if 4478  df-sn 4579  df-pr 4581  df-op 4585  df-br 5097  df-opab 5159  df-xp 5628  df-rel 5629  df-fn 6493  df-f 6494  df-f1 6495  df-dom 8883
This theorem is referenced by:  domssl  8933  domssr  8934  2dom  8965  undom  8991  xpdom2  8998  domunsncan  9003  dom0  9031  fodomr  9054  domssex  9064  domtrfil  9114  sucdom2  9125  sdom1  9148  1sdom2dom  9152  infn0  9200  fodomfir  9226  hartogslem1  9445  infdifsn  9564  acndom  9959  acndom2  9962  fictb  10152  fin23lem41  10260  iundom2g  10448  pwfseq  10573  omssubadd  34406
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