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Theorem weth 8118
Description: Well-ordering theorem: any set  A can be well-ordered. This is an equivalent of the Axiom of Choice. Theorem 6 of [Suppes] p. 242. First proved by Ernst Zermelo (the "Z" in ZFC) in 1904. (Contributed by Mario Carneiro, 5-Jan-2013.)
Assertion
Ref Expression
weth  |-  ( A  e.  V  ->  E. x  x  We  A )
Distinct variable group:    x, A
Dummy variable  y is distinct from all other variables.
Allowed substitution hint:    V( x)

Proof of Theorem weth
StepHypRef Expression
1 weeq2 4382 . . 3  |-  ( y  =  A  ->  (
x  We  y  <->  x  We  A ) )
21exbidv 1613 . 2  |-  ( y  =  A  ->  ( E. x  x  We  y 
<->  E. x  x  We  A ) )
3 dfac8 7757 . . 3  |-  (CHOICE  <->  A. y E. x  x  We  y )
43axaci 8091 . 2  |-  E. x  x  We  y
52, 4vtoclg 2845 1  |-  ( A  e.  V  ->  E. x  x  We  A )
Colors of variables: wff set class
Syntax hints:    -> wi 6   E.wex 1529    = wceq 1624    e. wcel 1685    We wwe 4351
This theorem was proved from axioms:  ax-1 7  ax-2 8  ax-3 9  ax-mp 10  ax-gen 1534  ax-5 1545  ax-17 1604  ax-9 1637  ax-8 1645  ax-13 1687  ax-14 1689  ax-6 1704  ax-7 1709  ax-11 1716  ax-12 1868  ax-ext 2266  ax-rep 4133  ax-sep 4143  ax-nul 4151  ax-pow 4188  ax-pr 4214  ax-un 4512  ax-ac2 8085
This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-3or 937  df-3an 938  df-tru 1312  df-ex 1530  df-nf 1533  df-sb 1632  df-eu 2149  df-mo 2150  df-clab 2272  df-cleq 2278  df-clel 2281  df-nfc 2410  df-ne 2450  df-ral 2550  df-rex 2551  df-reu 2552  df-rmo 2553  df-rab 2554  df-v 2792  df-sbc 2994  df-csb 3084  df-dif 3157  df-un 3159  df-in 3161  df-ss 3168  df-pss 3170  df-nul 3458  df-if 3568  df-pw 3629  df-sn 3648  df-pr 3649  df-tp 3650  df-op 3651  df-uni 3830  df-int 3865  df-iun 3909  df-br 4026  df-opab 4080  df-mpt 4081  df-tr 4116  df-eprel 4305  df-id 4309  df-po 4314  df-so 4315  df-fr 4352  df-se 4353  df-we 4354  df-ord 4395  df-on 4396  df-suc 4398  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-fun 5224  df-fn 5225  df-f 5226  df-f1 5227  df-fo 5228  df-f1o 5229  df-fv 5230  df-isom 5231  df-iota 6253  df-riota 6300  df-recs 6384  df-en 6860  df-card 7568  df-ac 7739
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