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Theorem fineqv 8733
Description: If the Axiom of Infinity is denied, then all sets are finite (which implies the Axiom of Choice). (Contributed by Mario Carneiro, 20-Jan-2013.) (Revised by Mario Carneiro, 3-Jan-2015.)
Assertion
Ref Expression
fineqv (¬ ω ∈ V ↔ Fin = V)

Proof of Theorem fineqv
StepHypRef Expression
1 ssv 3991 . . . 4 Fin ⊆ V
21a1i 11 . . 3 (¬ ω ∈ V → Fin ⊆ V)
3 vex 3497 . . . . . . . 8 𝑎 ∈ V
4 fineqvlem 8732 . . . . . . . 8 ((𝑎 ∈ V ∧ ¬ 𝑎 ∈ Fin) → ω ≼ 𝒫 𝒫 𝑎)
53, 4mpan 688 . . . . . . 7 𝑎 ∈ Fin → ω ≼ 𝒫 𝒫 𝑎)
6 reldom 8515 . . . . . . . 8 Rel ≼
76brrelex1i 5608 . . . . . . 7 (ω ≼ 𝒫 𝒫 𝑎 → ω ∈ V)
85, 7syl 17 . . . . . 6 𝑎 ∈ Fin → ω ∈ V)
98con1i 149 . . . . 5 (¬ ω ∈ V → 𝑎 ∈ Fin)
109a1d 25 . . . 4 (¬ ω ∈ V → (𝑎 ∈ V → 𝑎 ∈ Fin))
1110ssrdv 3973 . . 3 (¬ ω ∈ V → V ⊆ Fin)
122, 11eqssd 3984 . 2 (¬ ω ∈ V → Fin = V)
13 ominf 8730 . . 3 ¬ ω ∈ Fin
14 eleq2 2901 . . 3 (Fin = V → (ω ∈ Fin ↔ ω ∈ V))
1513, 14mtbii 328 . 2 (Fin = V → ¬ ω ∈ V)
1612, 15impbii 211 1 (¬ ω ∈ V ↔ Fin = V)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wb 208   = wceq 1537  wcel 2114  Vcvv 3494  wss 3936  𝒫 cpw 4539   class class class wbr 5066  ωcom 7580  cdom 8507  Fincfn 8509
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-rep 5190  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4839  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-tr 5173  df-id 5460  df-eprel 5465  df-po 5474  df-so 5475  df-fr 5514  df-we 5516  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-om 7581  df-er 8289  df-en 8510  df-dom 8511  df-sdom 8512  df-fin 8513
This theorem is referenced by:  npomex  10418  finorwe  34666
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