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Theorem ttukeylem2 8382
Description: Lemma for ttukey 8390. A property of finite character is closed under subsets. (Contributed by Mario Carneiro, 15-May-2015.)
Hypotheses
Ref Expression
ttukeylem.1  |-  ( ph  ->  F : ( card `  ( U. A  \  B ) ) -1-1-onto-> ( U. A  \  B ) )
ttukeylem.2  |-  ( ph  ->  B  e.  A )
ttukeylem.3  |-  ( ph  ->  A. x ( x  e.  A  <->  ( ~P x  i^i  Fin )  C_  A ) )
Assertion
Ref Expression
ttukeylem2  |-  ( (
ph  /\  ( C  e.  A  /\  D  C_  C ) )  ->  D  e.  A )
Distinct variable groups:    x, C    x, D    x, A    x, B    x, F
Allowed substitution hint:    ph( x)

Proof of Theorem ttukeylem2
StepHypRef Expression
1 simpr 448 . . . . . 6  |-  ( (
ph  /\  D  C_  C
)  ->  D  C_  C
)
2 sspwb 4405 . . . . . 6  |-  ( D 
C_  C  <->  ~P D  C_ 
~P C )
31, 2sylib 189 . . . . 5  |-  ( (
ph  /\  D  C_  C
)  ->  ~P D  C_ 
~P C )
4 ssrin 3558 . . . . 5  |-  ( ~P D  C_  ~P C  ->  ( ~P D  i^i  Fin )  C_  ( ~P C  i^i  Fin ) )
5 sstr2 3347 . . . . 5  |-  ( ( ~P D  i^i  Fin )  C_  ( ~P C  i^i  Fin )  ->  (
( ~P C  i^i  Fin )  C_  A  ->  ( ~P D  i^i  Fin )  C_  A ) )
63, 4, 53syl 19 . . . 4  |-  ( (
ph  /\  D  C_  C
)  ->  ( ( ~P C  i^i  Fin )  C_  A  ->  ( ~P D  i^i  Fin )  C_  A ) )
7 ttukeylem.1 . . . . . 6  |-  ( ph  ->  F : ( card `  ( U. A  \  B ) ) -1-1-onto-> ( U. A  \  B ) )
8 ttukeylem.2 . . . . . 6  |-  ( ph  ->  B  e.  A )
9 ttukeylem.3 . . . . . 6  |-  ( ph  ->  A. x ( x  e.  A  <->  ( ~P x  i^i  Fin )  C_  A ) )
107, 8, 9ttukeylem1 8381 . . . . 5  |-  ( ph  ->  ( C  e.  A  <->  ( ~P C  i^i  Fin )  C_  A ) )
1110adantr 452 . . . 4  |-  ( (
ph  /\  D  C_  C
)  ->  ( C  e.  A  <->  ( ~P C  i^i  Fin )  C_  A
) )
127, 8, 9ttukeylem1 8381 . . . . 5  |-  ( ph  ->  ( D  e.  A  <->  ( ~P D  i^i  Fin )  C_  A ) )
1312adantr 452 . . . 4  |-  ( (
ph  /\  D  C_  C
)  ->  ( D  e.  A  <->  ( ~P D  i^i  Fin )  C_  A
) )
146, 11, 133imtr4d 260 . . 3  |-  ( (
ph  /\  D  C_  C
)  ->  ( C  e.  A  ->  D  e.  A ) )
1514impancom 428 . 2  |-  ( (
ph  /\  C  e.  A )  ->  ( D  C_  C  ->  D  e.  A ) )
1615impr 603 1  |-  ( (
ph  /\  ( C  e.  A  /\  D  C_  C ) )  ->  D  e.  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 177    /\ wa 359   A.wal 1549    e. wcel 1725    \ cdif 3309    i^i cin 3311    C_ wss 3312   ~Pcpw 3791   U.cuni 4007   -1-1-onto->wf1o 5445   ` cfv 5446   Fincfn 7101   cardccrd 7814
This theorem is referenced by:  ttukeylem6  8386  ttukeylem7  8387
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-13 1727  ax-14 1729  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950  ax-ext 2416  ax-rep 4312  ax-sep 4322  ax-nul 4330  ax-pow 4369  ax-pr 4395  ax-un 4693
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1328  df-ex 1551  df-nf 1554  df-sb 1659  df-eu 2284  df-mo 2285  df-clab 2422  df-cleq 2428  df-clel 2431  df-nfc 2560  df-ne 2600  df-ral 2702  df-rex 2703  df-reu 2704  df-rab 2706  df-v 2950  df-sbc 3154  df-csb 3244  df-dif 3315  df-un 3317  df-in 3319  df-ss 3326  df-pss 3328  df-nul 3621  df-if 3732  df-pw 3793  df-sn 3812  df-pr 3813  df-tp 3814  df-op 3815  df-uni 4008  df-iun 4087  df-br 4205  df-opab 4259  df-mpt 4260  df-tr 4295  df-eprel 4486  df-id 4490  df-po 4495  df-so 4496  df-fr 4533  df-we 4535  df-ord 4576  df-on 4577  df-lim 4578  df-suc 4579  df-om 4838  df-xp 4876  df-rel 4877  df-cnv 4878  df-co 4879  df-dm 4880  df-rn 4881  df-res 4882  df-ima 4883  df-iota 5410  df-fun 5448  df-fn 5449  df-f 5450  df-f1 5451  df-fo 5452  df-f1o 5453  df-fv 5454  df-1o 6716  df-en 7102  df-dom 7103  df-fin 7105
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