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Theorem domunsn 9111
Description: Dominance over a set with one element added. (Contributed by Mario Carneiro, 18-May-2015.)
Assertion
Ref Expression
domunsn (𝐴𝐵 → (𝐴 ∪ {𝐶}) ≼ 𝐵)

Proof of Theorem domunsn
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 sdom0 9093 . . . . 5 ¬ 𝐴 ≺ ∅
2 breq2 5113 . . . . 5 (𝐵 = ∅ → (𝐴𝐵𝐴 ≺ ∅))
31, 2mtbiri 330 . . . 4 (𝐵 = ∅ → ¬ 𝐴𝐵)
43con2i 140 . . 3 (𝐴𝐵 → ¬ 𝐵 = ∅)
5 neq0 4306 . . 3 𝐵 = ∅ ↔ ∃𝑧 𝑧𝐵)
64, 5sylib 221 . 2 (𝐴𝐵 → ∃𝑧 𝑧𝐵)
7 domdifsn 9044 . . . . 5 (𝐴𝐵𝐴 ≼ (𝐵 ∖ {𝑧}))
87adantr 485 . . . 4 ((𝐴𝐵𝑧𝐵) → 𝐴 ≼ (𝐵 ∖ {𝑧}))
9 en2sn 9034 . . . . . . 7 ((𝐶 ∈ V ∧ 𝑧 ∈ V) → {𝐶} ≈ {𝑧})
109elvd 3461 . . . . . 6 (𝐶 ∈ V → {𝐶} ≈ {𝑧})
11 endom 8972 . . . . . 6 ({𝐶} ≈ {𝑧} → {𝐶} ≼ {𝑧})
1210, 11syl 18 . . . . 5 (𝐶 ∈ V → {𝐶} ≼ {𝑧})
13 snprc 4683 . . . . . . 7 𝐶 ∈ V ↔ {𝐶} = ∅)
1413biimpi 219 . . . . . 6 𝐶 ∈ V → {𝐶} = ∅)
15 vsnex 5406 . . . . . . 7 {𝑧} ∈ V
16150dom 9091 . . . . . 6 ∅ ≼ {𝑧}
1714, 16eqbrtrdi 5150 . . . . 5 𝐶 ∈ V → {𝐶} ≼ {𝑧})
1812, 17pm2.61i 184 . . . 4 {𝐶} ≼ {𝑧}
19 disjdifr 4434 . . . . 5 ((𝐵 ∖ {𝑧}) ∩ {𝑧}) = ∅
20 undom 9049 . . . . 5 (((𝐴 ≼ (𝐵 ∖ {𝑧}) ∧ {𝐶} ≼ {𝑧}) ∧ ((𝐵 ∖ {𝑧}) ∩ {𝑧}) = ∅) → (𝐴 ∪ {𝐶}) ≼ ((𝐵 ∖ {𝑧}) ∪ {𝑧}))
2119, 20mpan2 703 . . . 4 ((𝐴 ≼ (𝐵 ∖ {𝑧}) ∧ {𝐶} ≼ {𝑧}) → (𝐴 ∪ {𝐶}) ≼ ((𝐵 ∖ {𝑧}) ∪ {𝑧}))
228, 18, 21sylancl 597 . . 3 ((𝐴𝐵𝑧𝐵) → (𝐴 ∪ {𝐶}) ≼ ((𝐵 ∖ {𝑧}) ∪ {𝑧}))
23 uncom 4112 . . . 4 ((𝐵 ∖ {𝑧}) ∪ {𝑧}) = ({𝑧} ∪ (𝐵 ∖ {𝑧}))
24 simpr 489 . . . . . 6 ((𝐴𝐵𝑧𝐵) → 𝑧𝐵)
2524snssd 4752 . . . . 5 ((𝐴𝐵𝑧𝐵) → {𝑧} ⊆ 𝐵)
26 undif 4443 . . . . 5 ({𝑧} ⊆ 𝐵 ↔ ({𝑧} ∪ (𝐵 ∖ {𝑧})) = 𝐵)
2725, 26sylib 221 . . . 4 ((𝐴𝐵𝑧𝐵) → ({𝑧} ∪ (𝐵 ∖ {𝑧})) = 𝐵)
2823, 27eqtrid 2810 . . 3 ((𝐴𝐵𝑧𝐵) → ((𝐵 ∖ {𝑧}) ∪ {𝑧}) = 𝐵)
2922, 28breqtrd 5137 . 2 ((𝐴𝐵𝑧𝐵) → (𝐴 ∪ {𝐶}) ≼ 𝐵)
306, 29exlimddv 1965 1 (𝐴𝐵 → (𝐴 ∪ {𝐶}) ≼ 𝐵)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 400   = wceq 1570  wex 1809  wcel 2143  Vcvv 3455  cdif 3902  cun 3903  cin 3904  wss 3905  c0 4286  {csn 4589   class class class wbr 5109  cen 8936  cdom 8937  csdm 8938
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5257  ax-nul 5269  ax-pow 5336  ax-pr 5404  ax-un 7732
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-pw 4564  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-br 5110  df-opab 5174  df-id 5556  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  df-fun 6538  df-fn 6539  df-f 6540  df-f1 6541  df-fo 6542  df-f1o 6543  df-en 8940  df-dom 8941  df-sdom 8942
This theorem is referenced by:  canthp1lem1  10632
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