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Theorem brdom4 9233
 Description: An equivalence to a dominance relation. (Contributed by NM, 28-Mar-2007.) (Revised by NM, 16-Jun-2017.)
Hypothesis
Ref Expression
brdom3.2 𝐵 ∈ V
Assertion
Ref Expression
brdom4 (𝐴𝐵 ↔ ∃𝑓(∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
Distinct variable groups:   𝑥,𝑓,𝑦,𝐴   𝐵,𝑓,𝑥,𝑦

Proof of Theorem brdom4
StepHypRef Expression
1 brdom3.2 . . . 4 𝐵 ∈ V
21brdom3 9231 . . 3 (𝐴𝐵 ↔ ∃𝑓(∀𝑥∃*𝑦 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
3 mormo 3135 . . . . . . 7 (∃*𝑦 𝑥𝑓𝑦 → ∃*𝑦𝐴 𝑥𝑓𝑦)
43alimi 1730 . . . . . 6 (∀𝑥∃*𝑦 𝑥𝑓𝑦 → ∀𝑥∃*𝑦𝐴 𝑥𝑓𝑦)
5 alral 2912 . . . . . 6 (∀𝑥∃*𝑦𝐴 𝑥𝑓𝑦 → ∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦)
64, 5syl 17 . . . . 5 (∀𝑥∃*𝑦 𝑥𝑓𝑦 → ∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦)
76anim1i 590 . . . 4 ((∀𝑥∃*𝑦 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → (∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
87eximi 1752 . . 3 (∃𝑓(∀𝑥∃*𝑦 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → ∃𝑓(∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
92, 8sylbi 206 . 2 (𝐴𝐵 → ∃𝑓(∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
10 inss2 3796 . . . . . . . . . . . . . . 15 (𝑓 ∩ (𝐵 × 𝐴)) ⊆ (𝐵 × 𝐴)
11 dmss 5245 . . . . . . . . . . . . . . 15 ((𝑓 ∩ (𝐵 × 𝐴)) ⊆ (𝐵 × 𝐴) → dom (𝑓 ∩ (𝐵 × 𝐴)) ⊆ dom (𝐵 × 𝐴))
1210, 11ax-mp 5 . . . . . . . . . . . . . 14 dom (𝑓 ∩ (𝐵 × 𝐴)) ⊆ dom (𝐵 × 𝐴)
13 dmxpss 5484 . . . . . . . . . . . . . 14 dom (𝐵 × 𝐴) ⊆ 𝐵
1412, 13sstri 3577 . . . . . . . . . . . . 13 dom (𝑓 ∩ (𝐵 × 𝐴)) ⊆ 𝐵
1514sseli 3564 . . . . . . . . . . . 12 (𝑥 ∈ dom (𝑓 ∩ (𝐵 × 𝐴)) → 𝑥𝐵)
16 rnss 5275 . . . . . . . . . . . . . . . . . 18 ((𝑓 ∩ (𝐵 × 𝐴)) ⊆ (𝐵 × 𝐴) → ran (𝑓 ∩ (𝐵 × 𝐴)) ⊆ ran (𝐵 × 𝐴))
1710, 16ax-mp 5 . . . . . . . . . . . . . . . . 17 ran (𝑓 ∩ (𝐵 × 𝐴)) ⊆ ran (𝐵 × 𝐴)
18 rnxpss 5485 . . . . . . . . . . . . . . . . 17 ran (𝐵 × 𝐴) ⊆ 𝐴
1917, 18sstri 3577 . . . . . . . . . . . . . . . 16 ran (𝑓 ∩ (𝐵 × 𝐴)) ⊆ 𝐴
2019sseli 3564 . . . . . . . . . . . . . . 15 (𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴)) → 𝑦𝐴)
21 inss1 3795 . . . . . . . . . . . . . . . 16 (𝑓 ∩ (𝐵 × 𝐴)) ⊆ 𝑓
2221ssbri 4627 . . . . . . . . . . . . . . 15 (𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦𝑥𝑓𝑦)
2320, 22anim12i 588 . . . . . . . . . . . . . 14 ((𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴)) ∧ 𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦) → (𝑦𝐴𝑥𝑓𝑦))
2423moimi 2508 . . . . . . . . . . . . 13 (∃*𝑦(𝑦𝐴𝑥𝑓𝑦) → ∃*𝑦(𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴)) ∧ 𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦))
25 df-rmo 2904 . . . . . . . . . . . . 13 (∃*𝑦𝐴 𝑥𝑓𝑦 ↔ ∃*𝑦(𝑦𝐴𝑥𝑓𝑦))
26 df-rmo 2904 . . . . . . . . . . . . 13 (∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦 ↔ ∃*𝑦(𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴)) ∧ 𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦))
2724, 25, 263imtr4i 280 . . . . . . . . . . . 12 (∃*𝑦𝐴 𝑥𝑓𝑦 → ∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦)
2815, 27imim12i 60 . . . . . . . . . . 11 ((𝑥𝐵 → ∃*𝑦𝐴 𝑥𝑓𝑦) → (𝑥 ∈ dom (𝑓 ∩ (𝐵 × 𝐴)) → ∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦))
2928ralimi2 2933 . . . . . . . . . 10 (∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 → ∀𝑥 ∈ dom (𝑓 ∩ (𝐵 × 𝐴))∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦)
30 relxp 5150 . . . . . . . . . . 11 Rel (𝐵 × 𝐴)
31 relin2 5160 . . . . . . . . . . 11 (Rel (𝐵 × 𝐴) → Rel (𝑓 ∩ (𝐵 × 𝐴)))
3230, 31ax-mp 5 . . . . . . . . . 10 Rel (𝑓 ∩ (𝐵 × 𝐴))
3329, 32jctil 558 . . . . . . . . 9 (∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 → (Rel (𝑓 ∩ (𝐵 × 𝐴)) ∧ ∀𝑥 ∈ dom (𝑓 ∩ (𝐵 × 𝐴))∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦))
34 dffun9 5832 . . . . . . . . 9 (Fun (𝑓 ∩ (𝐵 × 𝐴)) ↔ (Rel (𝑓 ∩ (𝐵 × 𝐴)) ∧ ∀𝑥 ∈ dom (𝑓 ∩ (𝐵 × 𝐴))∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦))
3533, 34sylibr 223 . . . . . . . 8 (∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 → Fun (𝑓 ∩ (𝐵 × 𝐴)))
36 funfn 5833 . . . . . . . 8 (Fun (𝑓 ∩ (𝐵 × 𝐴)) ↔ (𝑓 ∩ (𝐵 × 𝐴)) Fn dom (𝑓 ∩ (𝐵 × 𝐴)))
3735, 36sylib 207 . . . . . . 7 (∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 → (𝑓 ∩ (𝐵 × 𝐴)) Fn dom (𝑓 ∩ (𝐵 × 𝐴)))
38 rninxp 5492 . . . . . . . 8 (ran (𝑓 ∩ (𝐵 × 𝐴)) = 𝐴 ↔ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥)
3938biimpri 217 . . . . . . 7 (∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥 → ran (𝑓 ∩ (𝐵 × 𝐴)) = 𝐴)
4037, 39anim12i 588 . . . . . 6 ((∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → ((𝑓 ∩ (𝐵 × 𝐴)) Fn dom (𝑓 ∩ (𝐵 × 𝐴)) ∧ ran (𝑓 ∩ (𝐵 × 𝐴)) = 𝐴))
41 df-fo 5810 . . . . . 6 ((𝑓 ∩ (𝐵 × 𝐴)):dom (𝑓 ∩ (𝐵 × 𝐴))–onto𝐴 ↔ ((𝑓 ∩ (𝐵 × 𝐴)) Fn dom (𝑓 ∩ (𝐵 × 𝐴)) ∧ ran (𝑓 ∩ (𝐵 × 𝐴)) = 𝐴))
4240, 41sylibr 223 . . . . 5 ((∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → (𝑓 ∩ (𝐵 × 𝐴)):dom (𝑓 ∩ (𝐵 × 𝐴))–onto𝐴)
43 vex 3176 . . . . . . . 8 𝑓 ∈ V
4443inex1 4727 . . . . . . 7 (𝑓 ∩ (𝐵 × 𝐴)) ∈ V
4544dmex 6991 . . . . . 6 dom (𝑓 ∩ (𝐵 × 𝐴)) ∈ V
4645fodom 9227 . . . . 5 ((𝑓 ∩ (𝐵 × 𝐴)):dom (𝑓 ∩ (𝐵 × 𝐴))–onto𝐴𝐴 ≼ dom (𝑓 ∩ (𝐵 × 𝐴)))
4742, 46syl 17 . . . 4 ((∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → 𝐴 ≼ dom (𝑓 ∩ (𝐵 × 𝐴)))
48 ssdomg 7887 . . . . 5 (𝐵 ∈ V → (dom (𝑓 ∩ (𝐵 × 𝐴)) ⊆ 𝐵 → dom (𝑓 ∩ (𝐵 × 𝐴)) ≼ 𝐵))
491, 14, 48mp2 9 . . . 4 dom (𝑓 ∩ (𝐵 × 𝐴)) ≼ 𝐵
50 domtr 7895 . . . 4 ((𝐴 ≼ dom (𝑓 ∩ (𝐵 × 𝐴)) ∧ dom (𝑓 ∩ (𝐵 × 𝐴)) ≼ 𝐵) → 𝐴𝐵)
5147, 49, 50sylancl 693 . . 3 ((∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → 𝐴𝐵)
5251exlimiv 1845 . 2 (∃𝑓(∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → 𝐴𝐵)
539, 52impbii 198 1 (𝐴𝐵 ↔ ∃𝑓(∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
 Colors of variables: wff setvar class Syntax hints:   ↔ wb 195   ∧ wa 383  ∀wal 1473   = wceq 1475  ∃wex 1695   ∈ wcel 1977  ∃*wmo 2459  ∀wral 2896  ∃wrex 2897  ∃*wrmo 2899  Vcvv 3173   ∩ cin 3539   ⊆ wss 3540   class class class wbr 4583   × cxp 5036  dom cdm 5038  ran crn 5039  Rel wrel 5043  Fun wfun 5798   Fn wfn 5799  –onto→wfo 5802   ≼ cdom 7839 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-ac2 9168 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-se 4998  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-isom 5813  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-er 7629  df-map 7746  df-en 7842  df-dom 7843  df-sdom 7844  df-card 8648  df-acn 8651  df-ac 8822 This theorem is referenced by:  brdom7disj  9234
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