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Theorem dfac8alem 8804
 Description: Lemma for dfac8a 8805. If the power set of a set has a choice function, then the set is numerable. (Contributed by NM, 10-Feb-1997.) (Revised by Mario Carneiro, 5-Jan-2013.)
Hypotheses
Ref Expression
dfac8alem.2 𝐹 = recs(𝐺)
dfac8alem.3 𝐺 = (𝑓 ∈ V ↦ (𝑔‘(𝐴 ∖ ran 𝑓)))
Assertion
Ref Expression
dfac8alem (𝐴𝐶 → (∃𝑔𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) → 𝐴 ∈ dom card))
Distinct variable groups:   𝑓,𝑔,𝑦,𝐴   𝐶,𝑔   𝑓,𝐹,𝑦
Allowed substitution hints:   𝐶(𝑦,𝑓)   𝐹(𝑔)   𝐺(𝑦,𝑓,𝑔)

Proof of Theorem dfac8alem
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 elex 3201 . . 3 (𝐴𝐶𝐴 ∈ V)
2 difss 3720 . . . . . . . . . . . 12 (𝐴 ∖ (𝐹𝑥)) ⊆ 𝐴
3 elpw2g 4792 . . . . . . . . . . . 12 (𝐴 ∈ V → ((𝐴 ∖ (𝐹𝑥)) ∈ 𝒫 𝐴 ↔ (𝐴 ∖ (𝐹𝑥)) ⊆ 𝐴))
42, 3mpbiri 248 . . . . . . . . . . 11 (𝐴 ∈ V → (𝐴 ∖ (𝐹𝑥)) ∈ 𝒫 𝐴)
5 neeq1 2852 . . . . . . . . . . . . 13 (𝑦 = (𝐴 ∖ (𝐹𝑥)) → (𝑦 ≠ ∅ ↔ (𝐴 ∖ (𝐹𝑥)) ≠ ∅))
6 fveq2 6153 . . . . . . . . . . . . . 14 (𝑦 = (𝐴 ∖ (𝐹𝑥)) → (𝑔𝑦) = (𝑔‘(𝐴 ∖ (𝐹𝑥))))
7 id 22 . . . . . . . . . . . . . 14 (𝑦 = (𝐴 ∖ (𝐹𝑥)) → 𝑦 = (𝐴 ∖ (𝐹𝑥)))
86, 7eleq12d 2692 . . . . . . . . . . . . 13 (𝑦 = (𝐴 ∖ (𝐹𝑥)) → ((𝑔𝑦) ∈ 𝑦 ↔ (𝑔‘(𝐴 ∖ (𝐹𝑥))) ∈ (𝐴 ∖ (𝐹𝑥))))
95, 8imbi12d 334 . . . . . . . . . . . 12 (𝑦 = (𝐴 ∖ (𝐹𝑥)) → ((𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ↔ ((𝐴 ∖ (𝐹𝑥)) ≠ ∅ → (𝑔‘(𝐴 ∖ (𝐹𝑥))) ∈ (𝐴 ∖ (𝐹𝑥)))))
109rspcv 3294 . . . . . . . . . . 11 ((𝐴 ∖ (𝐹𝑥)) ∈ 𝒫 𝐴 → (∀𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) → ((𝐴 ∖ (𝐹𝑥)) ≠ ∅ → (𝑔‘(𝐴 ∖ (𝐹𝑥))) ∈ (𝐴 ∖ (𝐹𝑥)))))
114, 10syl 17 . . . . . . . . . 10 (𝐴 ∈ V → (∀𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) → ((𝐴 ∖ (𝐹𝑥)) ≠ ∅ → (𝑔‘(𝐴 ∖ (𝐹𝑥))) ∈ (𝐴 ∖ (𝐹𝑥)))))
12113imp 1254 . . . . . . . . 9 ((𝐴 ∈ V ∧ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ (𝐴 ∖ (𝐹𝑥)) ≠ ∅) → (𝑔‘(𝐴 ∖ (𝐹𝑥))) ∈ (𝐴 ∖ (𝐹𝑥)))
13 dfac8alem.2 . . . . . . . . . . . 12 𝐹 = recs(𝐺)
1413tfr2 7446 . . . . . . . . . . 11 (𝑥 ∈ On → (𝐹𝑥) = (𝐺‘(𝐹𝑥)))
1513tfr1 7445 . . . . . . . . . . . . . 14 𝐹 Fn On
16 fnfun 5951 . . . . . . . . . . . . . 14 (𝐹 Fn On → Fun 𝐹)
1715, 16ax-mp 5 . . . . . . . . . . . . 13 Fun 𝐹
18 vex 3192 . . . . . . . . . . . . 13 𝑥 ∈ V
19 resfunexg 6439 . . . . . . . . . . . . 13 ((Fun 𝐹𝑥 ∈ V) → (𝐹𝑥) ∈ V)
2017, 18, 19mp2an 707 . . . . . . . . . . . 12 (𝐹𝑥) ∈ V
21 rneq 5316 . . . . . . . . . . . . . . . 16 (𝑓 = (𝐹𝑥) → ran 𝑓 = ran (𝐹𝑥))
22 df-ima 5092 . . . . . . . . . . . . . . . 16 (𝐹𝑥) = ran (𝐹𝑥)
2321, 22syl6eqr 2673 . . . . . . . . . . . . . . 15 (𝑓 = (𝐹𝑥) → ran 𝑓 = (𝐹𝑥))
2423difeq2d 3711 . . . . . . . . . . . . . 14 (𝑓 = (𝐹𝑥) → (𝐴 ∖ ran 𝑓) = (𝐴 ∖ (𝐹𝑥)))
2524fveq2d 6157 . . . . . . . . . . . . 13 (𝑓 = (𝐹𝑥) → (𝑔‘(𝐴 ∖ ran 𝑓)) = (𝑔‘(𝐴 ∖ (𝐹𝑥))))
26 dfac8alem.3 . . . . . . . . . . . . 13 𝐺 = (𝑓 ∈ V ↦ (𝑔‘(𝐴 ∖ ran 𝑓)))
27 fvex 6163 . . . . . . . . . . . . 13 (𝑔‘(𝐴 ∖ (𝐹𝑥))) ∈ V
2825, 26, 27fvmpt 6244 . . . . . . . . . . . 12 ((𝐹𝑥) ∈ V → (𝐺‘(𝐹𝑥)) = (𝑔‘(𝐴 ∖ (𝐹𝑥))))
2920, 28ax-mp 5 . . . . . . . . . . 11 (𝐺‘(𝐹𝑥)) = (𝑔‘(𝐴 ∖ (𝐹𝑥)))
3014, 29syl6eq 2671 . . . . . . . . . 10 (𝑥 ∈ On → (𝐹𝑥) = (𝑔‘(𝐴 ∖ (𝐹𝑥))))
3130eleq1d 2683 . . . . . . . . 9 (𝑥 ∈ On → ((𝐹𝑥) ∈ (𝐴 ∖ (𝐹𝑥)) ↔ (𝑔‘(𝐴 ∖ (𝐹𝑥))) ∈ (𝐴 ∖ (𝐹𝑥))))
3212, 31syl5ibrcom 237 . . . . . . . 8 ((𝐴 ∈ V ∧ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ (𝐴 ∖ (𝐹𝑥)) ≠ ∅) → (𝑥 ∈ On → (𝐹𝑥) ∈ (𝐴 ∖ (𝐹𝑥))))
33323expia 1264 . . . . . . 7 ((𝐴 ∈ V ∧ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦)) → ((𝐴 ∖ (𝐹𝑥)) ≠ ∅ → (𝑥 ∈ On → (𝐹𝑥) ∈ (𝐴 ∖ (𝐹𝑥)))))
3433com23 86 . . . . . 6 ((𝐴 ∈ V ∧ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦)) → (𝑥 ∈ On → ((𝐴 ∖ (𝐹𝑥)) ≠ ∅ → (𝐹𝑥) ∈ (𝐴 ∖ (𝐹𝑥)))))
3534ralrimiv 2960 . . . . 5 ((𝐴 ∈ V ∧ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦)) → ∀𝑥 ∈ On ((𝐴 ∖ (𝐹𝑥)) ≠ ∅ → (𝐹𝑥) ∈ (𝐴 ∖ (𝐹𝑥))))
3635ex 450 . . . 4 (𝐴 ∈ V → (∀𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) → ∀𝑥 ∈ On ((𝐴 ∖ (𝐹𝑥)) ≠ ∅ → (𝐹𝑥) ∈ (𝐴 ∖ (𝐹𝑥)))))
3715tz7.49c 7493 . . . . . 6 ((𝐴 ∈ V ∧ ∀𝑥 ∈ On ((𝐴 ∖ (𝐹𝑥)) ≠ ∅ → (𝐹𝑥) ∈ (𝐴 ∖ (𝐹𝑥)))) → ∃𝑥 ∈ On (𝐹𝑥):𝑥1-1-onto𝐴)
3837ex 450 . . . . 5 (𝐴 ∈ V → (∀𝑥 ∈ On ((𝐴 ∖ (𝐹𝑥)) ≠ ∅ → (𝐹𝑥) ∈ (𝐴 ∖ (𝐹𝑥))) → ∃𝑥 ∈ On (𝐹𝑥):𝑥1-1-onto𝐴))
3918f1oen 7928 . . . . . . 7 ((𝐹𝑥):𝑥1-1-onto𝐴𝑥𝐴)
40 isnumi 8724 . . . . . . 7 ((𝑥 ∈ On ∧ 𝑥𝐴) → 𝐴 ∈ dom card)
4139, 40sylan2 491 . . . . . 6 ((𝑥 ∈ On ∧ (𝐹𝑥):𝑥1-1-onto𝐴) → 𝐴 ∈ dom card)
4241rexlimiva 3022 . . . . 5 (∃𝑥 ∈ On (𝐹𝑥):𝑥1-1-onto𝐴𝐴 ∈ dom card)
4338, 42syl6 35 . . . 4 (𝐴 ∈ V → (∀𝑥 ∈ On ((𝐴 ∖ (𝐹𝑥)) ≠ ∅ → (𝐹𝑥) ∈ (𝐴 ∖ (𝐹𝑥))) → 𝐴 ∈ dom card))
4436, 43syld 47 . . 3 (𝐴 ∈ V → (∀𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) → 𝐴 ∈ dom card))
451, 44syl 17 . 2 (𝐴𝐶 → (∀𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) → 𝐴 ∈ dom card))
4645exlimdv 1858 1 (𝐴𝐶 → (∃𝑔𝑦 ∈ 𝒫 𝐴(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) → 𝐴 ∈ dom card))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 384   ∧ w3a 1036   = wceq 1480  ∃wex 1701   ∈ wcel 1987   ≠ wne 2790  ∀wral 2907  ∃wrex 2908  Vcvv 3189   ∖ cdif 3556   ⊆ wss 3559  ∅c0 3896  𝒫 cpw 4135   class class class wbr 4618   ↦ cmpt 4678  dom cdm 5079  ran crn 5080   ↾ cres 5081   “ cima 5082  Oncon0 5687  Fun wfun 5846   Fn wfn 5847  –1-1-onto→wf1o 5851  ‘cfv 5852  recscrecs 7419   ≈ cen 7904  cardccrd 8713 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-rep 4736  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6909 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2912  df-rex 2913  df-reu 2914  df-rab 2916  df-v 3191  df-sbc 3422  df-csb 3519  df-dif 3562  df-un 3564  df-in 3566  df-ss 3573  df-pss 3575  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-tp 4158  df-op 4160  df-uni 4408  df-int 4446  df-iun 4492  df-br 4619  df-opab 4679  df-mpt 4680  df-tr 4718  df-eprel 4990  df-id 4994  df-po 5000  df-so 5001  df-fr 5038  df-we 5040  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-pred 5644  df-ord 5690  df-on 5691  df-suc 5693  df-iota 5815  df-fun 5854  df-fn 5855  df-f 5856  df-f1 5857  df-fo 5858  df-f1o 5859  df-fv 5860  df-wrecs 7359  df-recs 7420  df-en 7908  df-card 8717 This theorem is referenced by:  dfac8a  8805
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