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Theorem wdom2d 8601
 Description: Deduce weak dominance from an implicit onto function (stated in a way which avoids ax-rep 4879). (Contributed by Stefan O'Rear, 13-Feb-2015.)
Hypotheses
Ref Expression
wdom2d.a (𝜑𝐴𝑉)
wdom2d.b (𝜑𝐵𝑊)
wdom2d.o ((𝜑𝑥𝐴) → ∃𝑦𝐵 𝑥 = 𝑋)
Assertion
Ref Expression
wdom2d (𝜑𝐴* 𝐵)
Distinct variable groups:   𝑥,𝐴,𝑦   𝑥,𝐵,𝑦   𝑥,𝑋   𝜑,𝑥,𝑦
Allowed substitution hints:   𝑉(𝑥,𝑦)   𝑊(𝑥,𝑦)   𝑋(𝑦)

Proof of Theorem wdom2d
Dummy variables 𝑣 𝑤 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 wdom2d.b . . . . . 6 (𝜑𝐵𝑊)
2 rabexg 4919 . . . . . 6 (𝐵𝑊 → {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ∈ V)
31, 2syl 17 . . . . 5 (𝜑 → {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ∈ V)
4 wdom2d.a . . . . 5 (𝜑𝐴𝑉)
5 xpexg 7077 . . . . 5 (({𝑧𝐵𝑧 / 𝑦𝑋𝐴} ∈ V ∧ 𝐴𝑉) → ({𝑧𝐵𝑧 / 𝑦𝑋𝐴} × 𝐴) ∈ V)
63, 4, 5syl2anc 696 . . . 4 (𝜑 → ({𝑧𝐵𝑧 / 𝑦𝑋𝐴} × 𝐴) ∈ V)
7 csbeq1 3642 . . . . . . . . . 10 (𝑧 = 𝑤𝑧 / 𝑦𝑋 = 𝑤 / 𝑦𝑋)
87eleq1d 2788 . . . . . . . . 9 (𝑧 = 𝑤 → (𝑧 / 𝑦𝑋𝐴𝑤 / 𝑦𝑋𝐴))
98elrab 3469 . . . . . . . 8 (𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↔ (𝑤𝐵𝑤 / 𝑦𝑋𝐴))
109simprbi 483 . . . . . . 7 (𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} → 𝑤 / 𝑦𝑋𝐴)
1110adantl 473 . . . . . 6 ((𝜑𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴}) → 𝑤 / 𝑦𝑋𝐴)
12 eqid 2724 . . . . . 6 (𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋) = (𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋)
1311, 12fmptd 6500 . . . . 5 (𝜑 → (𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋):{𝑧𝐵𝑧 / 𝑦𝑋𝐴}⟶𝐴)
14 fssxp 6173 . . . . 5 ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋):{𝑧𝐵𝑧 / 𝑦𝑋𝐴}⟶𝐴 → (𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋) ⊆ ({𝑧𝐵𝑧 / 𝑦𝑋𝐴} × 𝐴))
1513, 14syl 17 . . . 4 (𝜑 → (𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋) ⊆ ({𝑧𝐵𝑧 / 𝑦𝑋𝐴} × 𝐴))
166, 15ssexd 4913 . . 3 (𝜑 → (𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋) ∈ V)
17 wdom2d.o . . . . . . . 8 ((𝜑𝑥𝐴) → ∃𝑦𝐵 𝑥 = 𝑋)
18 eleq1 2791 . . . . . . . . . . . 12 (𝑥 = 𝑋 → (𝑥𝐴𝑋𝐴))
1918biimpcd 239 . . . . . . . . . . 11 (𝑥𝐴 → (𝑥 = 𝑋𝑋𝐴))
2019ancrd 578 . . . . . . . . . 10 (𝑥𝐴 → (𝑥 = 𝑋 → (𝑋𝐴𝑥 = 𝑋)))
2120adantl 473 . . . . . . . . 9 ((𝜑𝑥𝐴) → (𝑥 = 𝑋 → (𝑋𝐴𝑥 = 𝑋)))
2221reximdv 3118 . . . . . . . 8 ((𝜑𝑥𝐴) → (∃𝑦𝐵 𝑥 = 𝑋 → ∃𝑦𝐵 (𝑋𝐴𝑥 = 𝑋)))
2317, 22mpd 15 . . . . . . 7 ((𝜑𝑥𝐴) → ∃𝑦𝐵 (𝑋𝐴𝑥 = 𝑋))
24 nfv 1956 . . . . . . . 8 𝑣(𝑋𝐴𝑥 = 𝑋)
25 nfcsb1v 3655 . . . . . . . . . 10 𝑦𝑣 / 𝑦𝑋
2625nfel1 2881 . . . . . . . . 9 𝑦𝑣 / 𝑦𝑋𝐴
2725nfeq2 2882 . . . . . . . . 9 𝑦 𝑥 = 𝑣 / 𝑦𝑋
2826, 27nfan 1941 . . . . . . . 8 𝑦(𝑣 / 𝑦𝑋𝐴𝑥 = 𝑣 / 𝑦𝑋)
29 csbeq1a 3648 . . . . . . . . . 10 (𝑦 = 𝑣𝑋 = 𝑣 / 𝑦𝑋)
3029eleq1d 2788 . . . . . . . . 9 (𝑦 = 𝑣 → (𝑋𝐴𝑣 / 𝑦𝑋𝐴))
3129eqeq2d 2734 . . . . . . . . 9 (𝑦 = 𝑣 → (𝑥 = 𝑋𝑥 = 𝑣 / 𝑦𝑋))
3230, 31anbi12d 749 . . . . . . . 8 (𝑦 = 𝑣 → ((𝑋𝐴𝑥 = 𝑋) ↔ (𝑣 / 𝑦𝑋𝐴𝑥 = 𝑣 / 𝑦𝑋)))
3324, 28, 32cbvrex 3271 . . . . . . 7 (∃𝑦𝐵 (𝑋𝐴𝑥 = 𝑋) ↔ ∃𝑣𝐵 (𝑣 / 𝑦𝑋𝐴𝑥 = 𝑣 / 𝑦𝑋))
3423, 33sylib 208 . . . . . 6 ((𝜑𝑥𝐴) → ∃𝑣𝐵 (𝑣 / 𝑦𝑋𝐴𝑥 = 𝑣 / 𝑦𝑋))
35 csbeq1 3642 . . . . . . . . . . . . 13 (𝑧 = 𝑣𝑧 / 𝑦𝑋 = 𝑣 / 𝑦𝑋)
3635eleq1d 2788 . . . . . . . . . . . 12 (𝑧 = 𝑣 → (𝑧 / 𝑦𝑋𝐴𝑣 / 𝑦𝑋𝐴))
3736elrab 3469 . . . . . . . . . . 11 (𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↔ (𝑣𝐵𝑣 / 𝑦𝑋𝐴))
3837simprbi 483 . . . . . . . . . 10 (𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} → 𝑣 / 𝑦𝑋𝐴)
39 csbeq1 3642 . . . . . . . . . . 11 (𝑤 = 𝑣𝑤 / 𝑦𝑋 = 𝑣 / 𝑦𝑋)
4039, 12fvmptg 6394 . . . . . . . . . 10 ((𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ∧ 𝑣 / 𝑦𝑋𝐴) → ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋)‘𝑣) = 𝑣 / 𝑦𝑋)
4138, 40mpdan 705 . . . . . . . . 9 (𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} → ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋)‘𝑣) = 𝑣 / 𝑦𝑋)
4241eqeq2d 2734 . . . . . . . 8 (𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} → (𝑥 = ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋)‘𝑣) ↔ 𝑥 = 𝑣 / 𝑦𝑋))
4342rexbiia 3142 . . . . . . 7 (∃𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴}𝑥 = ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋)‘𝑣) ↔ ∃𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴}𝑥 = 𝑣 / 𝑦𝑋)
4436rexrab 3476 . . . . . . 7 (∃𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴}𝑥 = 𝑣 / 𝑦𝑋 ↔ ∃𝑣𝐵 (𝑣 / 𝑦𝑋𝐴𝑥 = 𝑣 / 𝑦𝑋))
4543, 44bitri 264 . . . . . 6 (∃𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴}𝑥 = ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋)‘𝑣) ↔ ∃𝑣𝐵 (𝑣 / 𝑦𝑋𝐴𝑥 = 𝑣 / 𝑦𝑋))
4634, 45sylibr 224 . . . . 5 ((𝜑𝑥𝐴) → ∃𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴}𝑥 = ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋)‘𝑣))
4746ralrimiva 3068 . . . 4 (𝜑 → ∀𝑥𝐴𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴}𝑥 = ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋)‘𝑣))
48 dffo3 6489 . . . 4 ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋):{𝑧𝐵𝑧 / 𝑦𝑋𝐴}–onto𝐴 ↔ ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋):{𝑧𝐵𝑧 / 𝑦𝑋𝐴}⟶𝐴 ∧ ∀𝑥𝐴𝑣 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴}𝑥 = ((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋)‘𝑣)))
4913, 47, 48sylanbrc 701 . . 3 (𝜑 → (𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋):{𝑧𝐵𝑧 / 𝑦𝑋𝐴}–onto𝐴)
50 fowdom 8592 . . 3 (((𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋) ∈ V ∧ (𝑤 ∈ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ↦ 𝑤 / 𝑦𝑋):{𝑧𝐵𝑧 / 𝑦𝑋𝐴}–onto𝐴) → 𝐴* {𝑧𝐵𝑧 / 𝑦𝑋𝐴})
5116, 49, 50syl2anc 696 . 2 (𝜑𝐴* {𝑧𝐵𝑧 / 𝑦𝑋𝐴})
52 ssrab2 3793 . . . 4 {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ⊆ 𝐵
53 ssdomg 8118 . . . 4 (𝐵𝑊 → ({𝑧𝐵𝑧 / 𝑦𝑋𝐴} ⊆ 𝐵 → {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ≼ 𝐵))
5452, 53mpi 20 . . 3 (𝐵𝑊 → {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ≼ 𝐵)
55 domwdom 8595 . . 3 ({𝑧𝐵𝑧 / 𝑦𝑋𝐴} ≼ 𝐵 → {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ≼* 𝐵)
561, 54, 553syl 18 . 2 (𝜑 → {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ≼* 𝐵)
57 wdomtr 8596 . 2 ((𝐴* {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ∧ {𝑧𝐵𝑧 / 𝑦𝑋𝐴} ≼* 𝐵) → 𝐴* 𝐵)
5851, 56, 57syl2anc 696 1 (𝜑𝐴* 𝐵)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   = wceq 1596   ∈ wcel 2103  ∀wral 3014  ∃wrex 3015  {crab 3018  Vcvv 3304  ⦋csb 3639   ⊆ wss 3680   class class class wbr 4760   ↦ cmpt 4837   × cxp 5216  ⟶wf 5997  –onto→wfo 5999  ‘cfv 6001   ≼ cdom 8070   ≼* cwdom 8578 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1835  ax-4 1850  ax-5 1952  ax-6 2018  ax-7 2054  ax-8 2105  ax-9 2112  ax-10 2132  ax-11 2147  ax-12 2160  ax-13 2355  ax-ext 2704  ax-sep 4889  ax-nul 4897  ax-pow 4948  ax-pr 5011  ax-un 7066 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1599  df-ex 1818  df-nf 1823  df-sb 2011  df-eu 2575  df-mo 2576  df-clab 2711  df-cleq 2717  df-clel 2720  df-nfc 2855  df-ne 2897  df-ral 3019  df-rex 3020  df-rab 3023  df-v 3306  df-sbc 3542  df-csb 3640  df-dif 3683  df-un 3685  df-in 3687  df-ss 3694  df-nul 4024  df-if 4195  df-pw 4268  df-sn 4286  df-pr 4288  df-op 4292  df-uni 4545  df-br 4761  df-opab 4821  df-mpt 4838  df-id 5128  df-xp 5224  df-rel 5225  df-cnv 5226  df-co 5227  df-dm 5228  df-rn 5229  df-res 5230  df-ima 5231  df-iota 5964  df-fun 6003  df-fn 6004  df-f 6005  df-f1 6006  df-fo 6007  df-f1o 6008  df-fv 6009  df-er 7862  df-en 8073  df-dom 8074  df-sdom 8075  df-wdom 8580 This theorem is referenced by:  wdomd  8602  brwdom3  8603  unwdomg  8605  xpwdomg  8606  wdom2d2  38021
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