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Theorem dfac10b 10133
Description: Axiom of Choice equivalent: every set is equinumerous to an ordinal (quantifier-free short cryptic version alluded to in df-ac 10110). (Contributed by Stefan O'Rear, 17-Jan-2015.)
Assertion
Ref Expression
dfac10b (CHOICE ↔ ( ≈ “ On) = V)

Proof of Theorem dfac10b
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 vex 3478 . . . . 5 𝑥 ∈ V
21elima 6064 . . . 4 (𝑥 ∈ ( ≈ “ On) ↔ ∃𝑦 ∈ On 𝑦𝑥)
32bicomi 223 . . 3 (∃𝑦 ∈ On 𝑦𝑥𝑥 ∈ ( ≈ “ On))
43albii 1821 . 2 (∀𝑥𝑦 ∈ On 𝑦𝑥 ↔ ∀𝑥 𝑥 ∈ ( ≈ “ On))
5 dfac10c 10132 . 2 (CHOICE ↔ ∀𝑥𝑦 ∈ On 𝑦𝑥)
6 eqv 3483 . 2 (( ≈ “ On) = V ↔ ∀𝑥 𝑥 ∈ ( ≈ “ On))
74, 5, 63bitr4i 302 1 (CHOICE ↔ ( ≈ “ On) = V)
Colors of variables: wff setvar class
Syntax hints:  wb 205  wal 1539   = wceq 1541  wcel 2106  wrex 3070  Vcvv 3474   class class class wbr 5148  cima 5679  Oncon0 6364  cen 8935  CHOICEwac 10109
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 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-rep 5285  ax-sep 5299  ax-nul 5306  ax-pow 5363  ax-pr 5427  ax-un 7724
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3or 1088  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-ral 3062  df-rex 3071  df-rmo 3376  df-reu 3377  df-rab 3433  df-v 3476  df-sbc 3778  df-csb 3894  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-pss 3967  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-int 4951  df-iun 4999  df-br 5149  df-opab 5211  df-mpt 5232  df-tr 5266  df-id 5574  df-eprel 5580  df-po 5588  df-so 5589  df-fr 5631  df-se 5632  df-we 5633  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-res 5688  df-ima 5689  df-pred 6300  df-ord 6367  df-on 6368  df-suc 6370  df-iota 6495  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-isom 6552  df-riota 7364  df-ov 7411  df-2nd 7975  df-frecs 8265  df-wrecs 8296  df-recs 8370  df-en 8939  df-card 9933  df-ac 10110
This theorem is referenced by:  axac10  41762
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