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Theorem sbthlem10 8612
Description: Lemma for sbth 8613. (Contributed by NM, 28-Mar-1998.)
Hypotheses
Ref Expression
sbthlem.1 𝐴 ∈ V
sbthlem.2 𝐷 = {𝑥 ∣ (𝑥𝐴 ∧ (𝑔 “ (𝐵 ∖ (𝑓𝑥))) ⊆ (𝐴𝑥))}
sbthlem.3 𝐻 = ((𝑓 𝐷) ∪ (𝑔 ↾ (𝐴 𝐷)))
sbthlem.4 𝐵 ∈ V
Assertion
Ref Expression
sbthlem10 ((𝐴𝐵𝐵𝐴) → 𝐴𝐵)
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐷   𝑥,𝑓,𝑔   𝑥,𝐻   𝑓,𝑔,𝐴   𝐵,𝑓,𝑔
Allowed substitution hints:   𝐷(𝑓,𝑔)   𝐻(𝑓,𝑔)

Proof of Theorem sbthlem10
StepHypRef Expression
1 sbthlem.4 . . . . 5 𝐵 ∈ V
21brdom 8496 . . . 4 (𝐴𝐵 ↔ ∃𝑓 𝑓:𝐴1-1𝐵)
3 sbthlem.1 . . . . 5 𝐴 ∈ V
43brdom 8496 . . . 4 (𝐵𝐴 ↔ ∃𝑔 𝑔:𝐵1-1𝐴)
52, 4anbi12i 629 . . 3 ((𝐴𝐵𝐵𝐴) ↔ (∃𝑓 𝑓:𝐴1-1𝐵 ∧ ∃𝑔 𝑔:𝐵1-1𝐴))
6 exdistrv 1957 . . 3 (∃𝑓𝑔(𝑓:𝐴1-1𝐵𝑔:𝐵1-1𝐴) ↔ (∃𝑓 𝑓:𝐴1-1𝐵 ∧ ∃𝑔 𝑔:𝐵1-1𝐴))
75, 6bitr4i 281 . 2 ((𝐴𝐵𝐵𝐴) ↔ ∃𝑓𝑔(𝑓:𝐴1-1𝐵𝑔:𝐵1-1𝐴))
8 sbthlem.3 . . . . 5 𝐻 = ((𝑓 𝐷) ∪ (𝑔 ↾ (𝐴 𝐷)))
9 vex 3474 . . . . . . 7 𝑓 ∈ V
109resex 5872 . . . . . 6 (𝑓 𝐷) ∈ V
11 vex 3474 . . . . . . . 8 𝑔 ∈ V
1211cnvex 7605 . . . . . . 7 𝑔 ∈ V
1312resex 5872 . . . . . 6 (𝑔 ↾ (𝐴 𝐷)) ∈ V
1410, 13unex 7444 . . . . 5 ((𝑓 𝐷) ∪ (𝑔 ↾ (𝐴 𝐷))) ∈ V
158, 14eqeltri 2908 . . . 4 𝐻 ∈ V
16 sbthlem.2 . . . . 5 𝐷 = {𝑥 ∣ (𝑥𝐴 ∧ (𝑔 “ (𝐵 ∖ (𝑓𝑥))) ⊆ (𝐴𝑥))}
173, 16, 8sbthlem9 8611 . . . 4 ((𝑓:𝐴1-1𝐵𝑔:𝐵1-1𝐴) → 𝐻:𝐴1-1-onto𝐵)
18 f1oen3g 8500 . . . 4 ((𝐻 ∈ V ∧ 𝐻:𝐴1-1-onto𝐵) → 𝐴𝐵)
1915, 17, 18sylancr 590 . . 3 ((𝑓:𝐴1-1𝐵𝑔:𝐵1-1𝐴) → 𝐴𝐵)
2019exlimivv 1934 . 2 (∃𝑓𝑔(𝑓:𝐴1-1𝐵𝑔:𝐵1-1𝐴) → 𝐴𝐵)
217, 20sylbi 220 1 ((𝐴𝐵𝐵𝐴) → 𝐴𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 399   = wceq 1538  wex 1781  wcel 2115  {cab 2799  Vcvv 3471  cdif 3907  cun 3908  wss 3910   cuni 4811   class class class wbr 5039  ccnv 5527  cres 5530  cima 5531  1-1wf1 6325  1-1-ontowf1o 6327  cen 8481  cdom 8482
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 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2178  ax-ext 2793  ax-sep 5176  ax-nul 5183  ax-pow 5239  ax-pr 5303  ax-un 7436
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2623  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2892  df-nfc 2960  df-ral 3131  df-rex 3132  df-rab 3135  df-v 3473  df-dif 3913  df-un 3915  df-in 3917  df-ss 3927  df-nul 4267  df-if 4441  df-pw 4514  df-sn 4541  df-pr 4543  df-op 4547  df-uni 4812  df-br 5040  df-opab 5102  df-id 5433  df-xp 5534  df-rel 5535  df-cnv 5536  df-co 5537  df-dm 5538  df-rn 5539  df-res 5540  df-ima 5541  df-fun 6330  df-fn 6331  df-f 6332  df-f1 6333  df-fo 6334  df-f1o 6335  df-en 8485  df-dom 8486
This theorem is referenced by:  sbth  8613
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