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Theorem 0domg 9096
Description: Any set dominates the empty set. (Contributed by NM, 26-Oct-2003.) (Revised by Mario Carneiro, 26-Apr-2015.) Avoid ax-pow 5362, ax-un 7721. (Revised by BTernaryTau, 29-Nov-2024.)
Assertion
Ref Expression
0domg (𝐴𝑉 → ∅ ≼ 𝐴)

Proof of Theorem 0domg
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 0ex 5306 . . 3 ∅ ∈ V
2 f1eq1 6779 . . 3 (𝑓 = ∅ → (𝑓:∅–1-1𝐴 ↔ ∅:∅–1-1𝐴))
3 f10 6863 . . 3 ∅:∅–1-1𝐴
41, 2, 3ceqsexv2d 3528 . 2 𝑓 𝑓:∅–1-1𝐴
5 brdom2g 8947 . . 3 ((∅ ∈ V ∧ 𝐴𝑉) → (∅ ≼ 𝐴 ↔ ∃𝑓 𝑓:∅–1-1𝐴))
61, 5mpan 688 . 2 (𝐴𝑉 → (∅ ≼ 𝐴 ↔ ∃𝑓 𝑓:∅–1-1𝐴))
74, 6mpbiri 257 1 (𝐴𝑉 → ∅ ≼ 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wex 1781  wcel 2106  Vcvv 3474  c0 4321   class class class wbr 5147  1-1wf1 6537  cdom 8933
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-sep 5298  ax-nul 5305  ax-pr 5426
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-clab 2710  df-cleq 2724  df-clel 2810  df-ral 3062  df-rex 3071  df-rab 3433  df-v 3476  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-nul 4322  df-if 4528  df-sn 4628  df-pr 4630  df-op 4634  df-br 5148  df-opab 5210  df-id 5573  df-xp 5681  df-rel 5682  df-cnv 5683  df-co 5684  df-dm 5685  df-rn 5686  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-dom 8937
This theorem is referenced by:  dom0OLD  9099  0sdomg  9100  0sdomgOLD  9101  0dom  9102  sdom0OLD  9105  carddomi2  9961  wdomfil  10052  wdomnumr  10055  hashge0  14343  ufildom1  23421  harn0  41829  safesnsupfidom1o  42153  sn1dom  42262
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