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Theorem brdom4 10287
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 10285 . . 3 (𝐴𝐵 ↔ ∃𝑓(∀𝑥∃*𝑦 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
3 mormo 3359 . . . . . . 7 (∃*𝑦 𝑥𝑓𝑦 → ∃*𝑦𝐴 𝑥𝑓𝑦)
43alimi 1818 . . . . . 6 (∀𝑥∃*𝑦 𝑥𝑓𝑦 → ∀𝑥∃*𝑦𝐴 𝑥𝑓𝑦)
5 alral 3082 . . . . . 6 (∀𝑥∃*𝑦𝐴 𝑥𝑓𝑦 → ∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦)
64, 5syl 17 . . . . 5 (∀𝑥∃*𝑦 𝑥𝑓𝑦 → ∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦)
76anim1i 615 . . . 4 ((∀𝑥∃*𝑦 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → (∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
87eximi 1841 . . 3 (∃𝑓(∀𝑥∃*𝑦 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → ∃𝑓(∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
92, 8sylbi 216 . 2 (𝐴𝐵 → ∃𝑓(∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
10 inss2 4169 . . . . . . . . . . . . . . 15 (𝑓 ∩ (𝐵 × 𝐴)) ⊆ (𝐵 × 𝐴)
11 dmss 5810 . . . . . . . . . . . . . . 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 6073 . . . . . . . . . . . . . 14 dom (𝐵 × 𝐴) ⊆ 𝐵
1412, 13sstri 3935 . . . . . . . . . . . . 13 dom (𝑓 ∩ (𝐵 × 𝐴)) ⊆ 𝐵
1514sseli 3922 . . . . . . . . . . . 12 (𝑥 ∈ dom (𝑓 ∩ (𝐵 × 𝐴)) → 𝑥𝐵)
1610rnssi 5848 . . . . . . . . . . . . . . . . 17 ran (𝑓 ∩ (𝐵 × 𝐴)) ⊆ ran (𝐵 × 𝐴)
17 rnxpss 6074 . . . . . . . . . . . . . . . . 17 ran (𝐵 × 𝐴) ⊆ 𝐴
1816, 17sstri 3935 . . . . . . . . . . . . . . . 16 ran (𝑓 ∩ (𝐵 × 𝐴)) ⊆ 𝐴
1918sseli 3922 . . . . . . . . . . . . . . 15 (𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴)) → 𝑦𝐴)
20 inss1 4168 . . . . . . . . . . . . . . . 16 (𝑓 ∩ (𝐵 × 𝐴)) ⊆ 𝑓
2120ssbri 5124 . . . . . . . . . . . . . . 15 (𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦𝑥𝑓𝑦)
2219, 21anim12i 613 . . . . . . . . . . . . . 14 ((𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴)) ∧ 𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦) → (𝑦𝐴𝑥𝑓𝑦))
2322moimi 2547 . . . . . . . . . . . . 13 (∃*𝑦(𝑦𝐴𝑥𝑓𝑦) → ∃*𝑦(𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴)) ∧ 𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦))
24 df-rmo 3074 . . . . . . . . . . . . 13 (∃*𝑦𝐴 𝑥𝑓𝑦 ↔ ∃*𝑦(𝑦𝐴𝑥𝑓𝑦))
25 df-rmo 3074 . . . . . . . . . . . . 13 (∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦 ↔ ∃*𝑦(𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴)) ∧ 𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦))
2623, 24, 253imtr4i 292 . . . . . . . . . . . 12 (∃*𝑦𝐴 𝑥𝑓𝑦 → ∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦)
2715, 26imim12i 62 . . . . . . . . . . 11 ((𝑥𝐵 → ∃*𝑦𝐴 𝑥𝑓𝑦) → (𝑥 ∈ dom (𝑓 ∩ (𝐵 × 𝐴)) → ∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦))
2827ralimi2 3086 . . . . . . . . . 10 (∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 → ∀𝑥 ∈ dom (𝑓 ∩ (𝐵 × 𝐴))∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦)
29 relinxp 5723 . . . . . . . . . 10 Rel (𝑓 ∩ (𝐵 × 𝐴))
3028, 29jctil 520 . . . . . . . . 9 (∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 → (Rel (𝑓 ∩ (𝐵 × 𝐴)) ∧ ∀𝑥 ∈ dom (𝑓 ∩ (𝐵 × 𝐴))∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦))
31 dffun9 6461 . . . . . . . . 9 (Fun (𝑓 ∩ (𝐵 × 𝐴)) ↔ (Rel (𝑓 ∩ (𝐵 × 𝐴)) ∧ ∀𝑥 ∈ dom (𝑓 ∩ (𝐵 × 𝐴))∃*𝑦 ∈ ran (𝑓 ∩ (𝐵 × 𝐴))𝑥(𝑓 ∩ (𝐵 × 𝐴))𝑦))
3230, 31sylibr 233 . . . . . . . 8 (∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 → Fun (𝑓 ∩ (𝐵 × 𝐴)))
3332funfnd 6463 . . . . . . 7 (∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 → (𝑓 ∩ (𝐵 × 𝐴)) Fn dom (𝑓 ∩ (𝐵 × 𝐴)))
34 rninxp 6081 . . . . . . . 8 (ran (𝑓 ∩ (𝐵 × 𝐴)) = 𝐴 ↔ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥)
3534biimpri 227 . . . . . . 7 (∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥 → ran (𝑓 ∩ (𝐵 × 𝐴)) = 𝐴)
3633, 35anim12i 613 . . . . . 6 ((∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → ((𝑓 ∩ (𝐵 × 𝐴)) Fn dom (𝑓 ∩ (𝐵 × 𝐴)) ∧ ran (𝑓 ∩ (𝐵 × 𝐴)) = 𝐴))
37 df-fo 6438 . . . . . 6 ((𝑓 ∩ (𝐵 × 𝐴)):dom (𝑓 ∩ (𝐵 × 𝐴))–onto𝐴 ↔ ((𝑓 ∩ (𝐵 × 𝐴)) Fn dom (𝑓 ∩ (𝐵 × 𝐴)) ∧ ran (𝑓 ∩ (𝐵 × 𝐴)) = 𝐴))
3836, 37sylibr 233 . . . . 5 ((∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → (𝑓 ∩ (𝐵 × 𝐴)):dom (𝑓 ∩ (𝐵 × 𝐴))–onto𝐴)
39 vex 3435 . . . . . . . 8 𝑓 ∈ V
4039inex1 5245 . . . . . . 7 (𝑓 ∩ (𝐵 × 𝐴)) ∈ V
4140dmex 7752 . . . . . 6 dom (𝑓 ∩ (𝐵 × 𝐴)) ∈ V
4241fodom 10280 . . . . 5 ((𝑓 ∩ (𝐵 × 𝐴)):dom (𝑓 ∩ (𝐵 × 𝐴))–onto𝐴𝐴 ≼ dom (𝑓 ∩ (𝐵 × 𝐴)))
4338, 42syl 17 . . . 4 ((∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → 𝐴 ≼ dom (𝑓 ∩ (𝐵 × 𝐴)))
44 ssdomg 8769 . . . . 5 (𝐵 ∈ V → (dom (𝑓 ∩ (𝐵 × 𝐴)) ⊆ 𝐵 → dom (𝑓 ∩ (𝐵 × 𝐴)) ≼ 𝐵))
451, 14, 44mp2 9 . . . 4 dom (𝑓 ∩ (𝐵 × 𝐴)) ≼ 𝐵
46 domtr 8776 . . . 4 ((𝐴 ≼ dom (𝑓 ∩ (𝐵 × 𝐴)) ∧ dom (𝑓 ∩ (𝐵 × 𝐴)) ≼ 𝐵) → 𝐴𝐵)
4743, 45, 46sylancl 586 . . 3 ((∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → 𝐴𝐵)
4847exlimiv 1937 . 2 (∃𝑓(∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥) → 𝐴𝐵)
499, 48impbii 208 1 (𝐴𝐵 ↔ ∃𝑓(∀𝑥𝐵 ∃*𝑦𝐴 𝑥𝑓𝑦 ∧ ∀𝑥𝐴𝑦𝐵 𝑦𝑓𝑥))
Colors of variables: wff setvar class
Syntax hints:  wb 205  wa 396  wal 1540   = wceq 1542  wex 1786  wcel 2110  ∃*wmo 2540  wral 3066  wrex 3067  ∃*wrmo 3069  Vcvv 3431  cin 3891  wss 3892   class class class wbr 5079   × cxp 5588  dom cdm 5590  ran crn 5591  Rel wrel 5595  Fun wfun 6426   Fn wfn 6427  ontowfo 6430  cdom 8714
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2015  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2711  ax-rep 5214  ax-sep 5227  ax-nul 5234  ax-pow 5292  ax-pr 5356  ax-un 7582  ax-ac2 10220
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2072  df-mo 2542  df-eu 2571  df-clab 2718  df-cleq 2732  df-clel 2818  df-nfc 2891  df-ne 2946  df-ral 3071  df-rex 3072  df-reu 3073  df-rmo 3074  df-rab 3075  df-v 3433  df-sbc 3721  df-csb 3838  df-dif 3895  df-un 3897  df-in 3899  df-ss 3909  df-pss 3911  df-nul 4263  df-if 4466  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4846  df-int 4886  df-iun 4932  df-br 5080  df-opab 5142  df-mpt 5163  df-tr 5197  df-id 5490  df-eprel 5496  df-po 5504  df-so 5505  df-fr 5545  df-se 5546  df-we 5547  df-xp 5596  df-rel 5597  df-cnv 5598  df-co 5599  df-dm 5600  df-rn 5601  df-res 5602  df-ima 5603  df-pred 6201  df-ord 6268  df-on 6269  df-suc 6271  df-iota 6390  df-fun 6434  df-fn 6435  df-f 6436  df-f1 6437  df-fo 6438  df-f1o 6439  df-fv 6440  df-isom 6441  df-riota 7228  df-ov 7274  df-oprab 7275  df-mpo 7276  df-1st 7824  df-2nd 7825  df-frecs 8088  df-wrecs 8119  df-recs 8193  df-er 8481  df-map 8600  df-en 8717  df-dom 8718  df-sdom 8719  df-card 9698  df-acn 9701  df-ac 9873
This theorem is referenced by:  brdom7disj  10288
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