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Theorem axdc 9343
Description: This theorem derives ax-dc 9268 using ax-ac 9281 and ax-inf 8535. Thus, AC implies DC, but not vice-versa (so that ZFC is strictly stronger than ZF+DC). (New usage is discouraged.) (Contributed by Mario Carneiro, 25-Jan-2013.)
Assertion
Ref Expression
axdc  |-  ( ( E. y E. z 
y x z  /\  ran  x  C_  dom  x )  ->  E. f A. n  e.  om  ( f `  n ) x ( f `  suc  n
) )
Distinct variable group:    f, n, x, y, z

Proof of Theorem axdc
Dummy variables  v 
g  u  w are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 breq2 4657 . . . . . . . . 9  |-  ( w  =  z  ->  (
u x w  <->  u x
z ) )
21cbvabv 2747 . . . . . . . 8  |-  { w  |  u x w }  =  { z  |  u x z }
3 breq1 4656 . . . . . . . . 9  |-  ( u  =  v  ->  (
u x z  <->  v x
z ) )
43abbidv 2741 . . . . . . . 8  |-  ( u  =  v  ->  { z  |  u x z }  =  { z  |  v x z } )
52, 4syl5eq 2668 . . . . . . 7  |-  ( u  =  v  ->  { w  |  u x w }  =  { z  |  v x z } )
65fveq2d 6195 . . . . . 6  |-  ( u  =  v  ->  (
g `  { w  |  u x w }
)  =  ( g `
 { z  |  v x z } ) )
76cbvmptv 4750 . . . . 5  |-  ( u  e.  _V  |->  ( g `
 { w  |  u x w }
) )  =  ( v  e.  _V  |->  ( g `  { z  |  v x z } ) )
8 rdgeq1 7507 . . . . 5  |-  ( ( u  e.  _V  |->  ( g `  { w  |  u x w }
) )  =  ( v  e.  _V  |->  ( g `  { z  |  v x z } ) )  ->  rec ( ( u  e. 
_V  |->  ( g `  { w  |  u x w } ) ) ,  y )  =  rec ( ( v  e.  _V  |->  ( g `  { z  |  v x z } ) ) ,  y ) )
9 reseq1 5390 . . . . 5  |-  ( rec ( ( u  e. 
_V  |->  ( g `  { w  |  u x w } ) ) ,  y )  =  rec ( ( v  e.  _V  |->  ( g `  { z  |  v x z } ) ) ,  y )  ->  ( rec ( ( u  e. 
_V  |->  ( g `  { w  |  u x w } ) ) ,  y )  |`  om )  =  ( rec ( ( v  e.  _V  |->  ( g `
 { z  |  v x z } ) ) ,  y )  |`  om )
)
107, 8, 9mp2b 10 . . . 4  |-  ( rec ( ( u  e. 
_V  |->  ( g `  { w  |  u x w } ) ) ,  y )  |`  om )  =  ( rec ( ( v  e.  _V  |->  ( g `
 { z  |  v x z } ) ) ,  y )  |`  om )
1110axdclem2 9342 . . 3  |-  ( E. z  y x z  ->  ( ran  x  C_ 
dom  x  ->  E. f A. n  e.  om  ( f `  n
) x ( f `
 suc  n )
) )
1211exlimiv 1858 . 2  |-  ( E. y E. z  y x z  ->  ( ran  x  C_  dom  x  ->  E. f A. n  e. 
om  ( f `  n ) x ( f `  suc  n
) ) )
1312imp 445 1  |-  ( ( E. y E. z 
y x z  /\  ran  x  C_  dom  x )  ->  E. f A. n  e.  om  ( f `  n ) x ( f `  suc  n
) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 384    = wceq 1483   E.wex 1704   {cab 2608   A.wral 2912   _Vcvv 3200    C_ wss 3574   class class class wbr 4653    |-> cmpt 4729   dom cdm 5114   ran crn 5115    |` cres 5116   suc csuc 5725   ` cfv 5888   omcom 7065   reccrdg 7505
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-inf2 8538  ax-ac2 9285
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-om 7066  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-ac 8939
This theorem is referenced by: (None)
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