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Theorem dfac10b 10038
Description: Axiom of Choice equivalent: every set is equinumerous to an ordinal (quantifier-free short cryptic version alluded to in df-ac 10014). (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 3441 . . . . 5 𝑥 ∈ V
21elima 6018 . . . 4 (𝑥 ∈ ( ≈ “ On) ↔ ∃𝑦 ∈ On 𝑦𝑥)
32bicomi 224 . . 3 (∃𝑦 ∈ On 𝑦𝑥𝑥 ∈ ( ≈ “ On))
43albii 1820 . 2 (∀𝑥𝑦 ∈ On 𝑦𝑥 ↔ ∀𝑥 𝑥 ∈ ( ≈ “ On))
5 dfac10c 10037 . 2 (CHOICE ↔ ∀𝑥𝑦 ∈ On 𝑦𝑥)
6 eqv 3447 . 2 (( ≈ “ On) = V ↔ ∀𝑥 𝑥 ∈ ( ≈ “ On))
74, 5, 63bitr4i 303 1 (CHOICE ↔ ( ≈ “ On) = V)
Colors of variables: wff setvar class
Syntax hints:  wb 206  wal 1539   = wceq 1541  wcel 2113  wrex 3057  Vcvv 3437   class class class wbr 5093  cima 5622  Oncon0 6311  cen 8872  CHOICEwac 10013
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 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2182  ax-ext 2705  ax-rep 5219  ax-sep 5236  ax-nul 5246  ax-pow 5305  ax-pr 5372  ax-un 7674
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2537  df-eu 2566  df-clab 2712  df-cleq 2725  df-clel 2808  df-nfc 2882  df-ne 2930  df-ral 3049  df-rex 3058  df-rmo 3347  df-reu 3348  df-rab 3397  df-v 3439  df-sbc 3738  df-csb 3847  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-pss 3918  df-nul 4283  df-if 4475  df-pw 4551  df-sn 4576  df-pr 4578  df-op 4582  df-uni 4859  df-int 4898  df-iun 4943  df-br 5094  df-opab 5156  df-mpt 5175  df-tr 5201  df-id 5514  df-eprel 5519  df-po 5527  df-so 5528  df-fr 5572  df-se 5573  df-we 5574  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-pred 6253  df-ord 6314  df-on 6315  df-suc 6317  df-iota 6442  df-fun 6488  df-fn 6489  df-f 6490  df-f1 6491  df-fo 6492  df-f1o 6493  df-fv 6494  df-isom 6495  df-riota 7309  df-ov 7355  df-2nd 7928  df-frecs 8217  df-wrecs 8248  df-recs 8297  df-en 8876  df-card 9839  df-ac 10014
This theorem is referenced by:  axac10  43150
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