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Theorem fin23lem15 7960
Description: Lemma for fin23 8015. 
U is a monotone function. (Contributed by Stefan O'Rear, 1-Nov-2014.)
Hypothesis
Ref Expression
fin23lem.a  |-  U  = seq𝜔 ( ( i  e.  om ,  u  e.  _V  |->  if ( ( ( t `
 i )  i^i  u )  =  (/) ,  u ,  ( ( t `  i )  i^i  u ) ) ) ,  U. ran  t )
Assertion
Ref Expression
fin23lem15  |-  ( ( ( A  e.  om  /\  B  e.  om )  /\  B  C_  A )  ->  ( U `  A )  C_  ( U `  B )
)
Distinct variable groups:    t, i, u    A, i, u    U, i, u
Allowed substitution hints:    A( t)    B( u, t, i)    U( t)

Proof of Theorem fin23lem15
Dummy variables  a 
b are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fveq2 5525 . . 3  |-  ( b  =  B  ->  ( U `  b )  =  ( U `  B ) )
21sseq1d 3205 . 2  |-  ( b  =  B  ->  (
( U `  b
)  C_  ( U `  B )  <->  ( U `  B )  C_  ( U `  B )
) )
3 fveq2 5525 . . 3  |-  ( b  =  a  ->  ( U `  b )  =  ( U `  a ) )
43sseq1d 3205 . 2  |-  ( b  =  a  ->  (
( U `  b
)  C_  ( U `  B )  <->  ( U `  a )  C_  ( U `  B )
) )
5 fveq2 5525 . . 3  |-  ( b  =  suc  a  -> 
( U `  b
)  =  ( U `
 suc  a )
)
65sseq1d 3205 . 2  |-  ( b  =  suc  a  -> 
( ( U `  b )  C_  ( U `  B )  <->  ( U `  suc  a
)  C_  ( U `  B ) ) )
7 fveq2 5525 . . 3  |-  ( b  =  A  ->  ( U `  b )  =  ( U `  A ) )
87sseq1d 3205 . 2  |-  ( b  =  A  ->  (
( U `  b
)  C_  ( U `  B )  <->  ( U `  A )  C_  ( U `  B )
) )
9 ssid 3197 . . 3  |-  ( U `
 B )  C_  ( U `  B )
109a1i 10 . 2  |-  ( B  e.  om  ->  ( U `  B )  C_  ( U `  B
) )
11 fin23lem.a . . . . 5  |-  U  = seq𝜔 ( ( i  e.  om ,  u  e.  _V  |->  if ( ( ( t `
 i )  i^i  u )  =  (/) ,  u ,  ( ( t `  i )  i^i  u ) ) ) ,  U. ran  t )
1211fin23lem13 7958 . . . 4  |-  ( a  e.  om  ->  ( U `  suc  a ) 
C_  ( U `  a ) )
1312ad2antrr 706 . . 3  |-  ( ( ( a  e.  om  /\  B  e.  om )  /\  B  C_  a )  ->  ( U `  suc  a )  C_  ( U `  a )
)
14 sstr2 3186 . . 3  |-  ( ( U `  suc  a
)  C_  ( U `  a )  ->  (
( U `  a
)  C_  ( U `  B )  ->  ( U `  suc  a ) 
C_  ( U `  B ) ) )
1513, 14syl 15 . 2  |-  ( ( ( a  e.  om  /\  B  e.  om )  /\  B  C_  a )  ->  ( ( U `
 a )  C_  ( U `  B )  ->  ( U `  suc  a )  C_  ( U `  B )
) )
162, 4, 6, 8, 10, 15findsg 4683 1  |-  ( ( ( A  e.  om  /\  B  e.  om )  /\  B  C_  A )  ->  ( U `  A )  C_  ( U `  B )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358    = wceq 1623    e. wcel 1684   _Vcvv 2788    i^i cin 3151    C_ wss 3152   (/)c0 3455   ifcif 3565   U.cuni 3827   suc csuc 4394   omcom 4656   ran crn 4690   ` cfv 5255    e. cmpt2 5860  seq𝜔cseqom 6459
This theorem is referenced by:  fin23lem16  7961
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-ral 2548  df-rex 2549  df-reu 2550  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-pss 3168  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-tp 3648  df-op 3649  df-uni 3828  df-iun 3907  df-br 4024  df-opab 4078  df-mpt 4079  df-tr 4114  df-eprel 4305  df-id 4309  df-po 4314  df-so 4315  df-fr 4352  df-we 4354  df-ord 4395  df-on 4396  df-lim 4397  df-suc 4398  df-om 4657  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-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-2nd 6123  df-recs 6388  df-rdg 6423  df-seqom 6460
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