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Theorem kardex 7711
Description: The collection of all sets equinumerous to a set  A and having the least possible rank is a set. This is the part of the justification of the definition of kard of [Enderton] p. 222. (Contributed by NM, 14-Dec-2003.)
Assertion
Ref Expression
kardex  |-  { x  |  ( x  ~~  A  /\  A. y ( y  ~~  A  -> 
( rank `  x )  C_  ( rank `  y
) ) ) }  e.  _V
Distinct variable group:    x, y, A

Proof of Theorem kardex
Dummy variable  z is distinct from all other variables.
StepHypRef Expression
1 df-rab 2637 . . 3  |-  { x  e.  { z  |  z 
~~  A }  |  A. y  e.  { z  |  z  ~~  A }  ( rank `  x
)  C_  ( rank `  y ) }  =  { x  |  (
x  e.  { z  |  z  ~~  A }  /\  A. y  e. 
{ z  |  z 
~~  A }  ( rank `  x )  C_  ( rank `  y )
) }
2 vex 2876 . . . . . 6  |-  x  e. 
_V
3 breq1 4128 . . . . . 6  |-  ( z  =  x  ->  (
z  ~~  A  <->  x  ~~  A ) )
42, 3elab 2999 . . . . 5  |-  ( x  e.  { z  |  z  ~~  A }  <->  x 
~~  A )
5 breq1 4128 . . . . . 6  |-  ( z  =  y  ->  (
z  ~~  A  <->  y  ~~  A ) )
65ralab 3012 . . . . 5  |-  ( A. y  e.  { z  |  z  ~~  A } 
( rank `  x )  C_  ( rank `  y
)  <->  A. y ( y 
~~  A  ->  ( rank `  x )  C_  ( rank `  y )
) )
74, 6anbi12i 678 . . . 4  |-  ( ( x  e.  { z  |  z  ~~  A }  /\  A. y  e. 
{ z  |  z 
~~  A }  ( rank `  x )  C_  ( rank `  y )
)  <->  ( x  ~~  A  /\  A. y ( y  ~~  A  -> 
( rank `  x )  C_  ( rank `  y
) ) ) )
87abbii 2478 . . 3  |-  { x  |  ( x  e. 
{ z  |  z 
~~  A }  /\  A. y  e.  { z  |  z  ~~  A }  ( rank `  x
)  C_  ( rank `  y ) ) }  =  { x  |  ( x  ~~  A  /\  A. y ( y 
~~  A  ->  ( rank `  x )  C_  ( rank `  y )
) ) }
91, 8eqtri 2386 . 2  |-  { x  e.  { z  |  z 
~~  A }  |  A. y  e.  { z  |  z  ~~  A }  ( rank `  x
)  C_  ( rank `  y ) }  =  { x  |  (
x  ~~  A  /\  A. y ( y  ~~  A  ->  ( rank `  x
)  C_  ( rank `  y ) ) ) }
10 scottex 7702 . 2  |-  { x  e.  { z  |  z 
~~  A }  |  A. y  e.  { z  |  z  ~~  A }  ( rank `  x
)  C_  ( rank `  y ) }  e.  _V
119, 10eqeltrri 2437 1  |-  { x  |  ( x  ~~  A  /\  A. y ( y  ~~  A  -> 
( rank `  x )  C_  ( rank `  y
) ) ) }  e.  _V
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358   A.wal 1545    e. wcel 1715   {cab 2352   A.wral 2628   {crab 2632   _Vcvv 2873    C_ wss 3238   class class class wbr 4125   ` cfv 5358    ~~ cen 7003   rankcrnk 7582
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1551  ax-5 1562  ax-17 1621  ax-9 1659  ax-8 1680  ax-13 1717  ax-14 1719  ax-6 1734  ax-7 1739  ax-11 1751  ax-12 1937  ax-ext 2347  ax-rep 4233  ax-sep 4243  ax-nul 4251  ax-pow 4290  ax-pr 4316  ax-un 4615  ax-reg 7453  ax-inf2 7489
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 936  df-3an 937  df-tru 1324  df-ex 1547  df-nf 1550  df-sb 1654  df-eu 2221  df-mo 2222  df-clab 2353  df-cleq 2359  df-clel 2362  df-nfc 2491  df-ne 2531  df-ral 2633  df-rex 2634  df-reu 2635  df-rab 2637  df-v 2875  df-sbc 3078  df-csb 3168  df-dif 3241  df-un 3243  df-in 3245  df-ss 3252  df-pss 3254  df-nul 3544  df-if 3655  df-pw 3716  df-sn 3735  df-pr 3736  df-tp 3737  df-op 3738  df-uni 3930  df-int 3965  df-iun 4009  df-br 4126  df-opab 4180  df-mpt 4181  df-tr 4216  df-eprel 4408  df-id 4412  df-po 4417  df-so 4418  df-fr 4455  df-we 4457  df-ord 4498  df-on 4499  df-lim 4500  df-suc 4501  df-om 4760  df-xp 4798  df-rel 4799  df-cnv 4800  df-co 4801  df-dm 4802  df-rn 4803  df-res 4804  df-ima 4805  df-iota 5322  df-fun 5360  df-fn 5361  df-f 5362  df-f1 5363  df-fo 5364  df-f1o 5365  df-fv 5366  df-recs 6530  df-rdg 6565  df-r1 7583  df-rank 7584
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