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Theorem omcl 7198
Description: Closure law for ordinal multiplication. Proposition 8.16 of [TakeutiZaring] p. 57. (Contributed by NM, 3-Aug-2004.) (Proof shortened by Andrew Salmon, 22-Oct-2011.)
Assertion
Ref Expression
omcl  |-  ( ( A  e.  On  /\  B  e.  On )  ->  ( A  .o  B
)  e.  On )

Proof of Theorem omcl
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 oveq2 6303 . . . 4  |-  ( x  =  (/)  ->  ( A  .o  x )  =  ( A  .o  (/) ) )
21eleq1d 2536 . . 3  |-  ( x  =  (/)  ->  ( ( A  .o  x )  e.  On  <->  ( A  .o  (/) )  e.  On ) )
3 oveq2 6303 . . . 4  |-  ( x  =  y  ->  ( A  .o  x )  =  ( A  .o  y
) )
43eleq1d 2536 . . 3  |-  ( x  =  y  ->  (
( A  .o  x
)  e.  On  <->  ( A  .o  y )  e.  On ) )
5 oveq2 6303 . . . 4  |-  ( x  =  suc  y  -> 
( A  .o  x
)  =  ( A  .o  suc  y ) )
65eleq1d 2536 . . 3  |-  ( x  =  suc  y  -> 
( ( A  .o  x )  e.  On  <->  ( A  .o  suc  y
)  e.  On ) )
7 oveq2 6303 . . . 4  |-  ( x  =  B  ->  ( A  .o  x )  =  ( A  .o  B
) )
87eleq1d 2536 . . 3  |-  ( x  =  B  ->  (
( A  .o  x
)  e.  On  <->  ( A  .o  B )  e.  On ) )
9 om0 7179 . . . 4  |-  ( A  e.  On  ->  ( A  .o  (/) )  =  (/) )
10 0elon 4937 . . . 4  |-  (/)  e.  On
119, 10syl6eqel 2563 . . 3  |-  ( A  e.  On  ->  ( A  .o  (/) )  e.  On )
12 oacl 7197 . . . . . . 7  |-  ( ( ( A  .o  y
)  e.  On  /\  A  e.  On )  ->  ( ( A  .o  y )  +o  A
)  e.  On )
1312expcom 435 . . . . . 6  |-  ( A  e.  On  ->  (
( A  .o  y
)  e.  On  ->  ( ( A  .o  y
)  +o  A )  e.  On ) )
1413adantr 465 . . . . 5  |-  ( ( A  e.  On  /\  y  e.  On )  ->  ( ( A  .o  y )  e.  On  ->  ( ( A  .o  y )  +o  A
)  e.  On ) )
15 omsuc 7188 . . . . . 6  |-  ( ( A  e.  On  /\  y  e.  On )  ->  ( A  .o  suc  y )  =  ( ( A  .o  y
)  +o  A ) )
1615eleq1d 2536 . . . . 5  |-  ( ( A  e.  On  /\  y  e.  On )  ->  ( ( A  .o  suc  y )  e.  On  <->  ( ( A  .o  y
)  +o  A )  e.  On ) )
1714, 16sylibrd 234 . . . 4  |-  ( ( A  e.  On  /\  y  e.  On )  ->  ( ( A  .o  y )  e.  On  ->  ( A  .o  suc  y )  e.  On ) )
1817expcom 435 . . 3  |-  ( y  e.  On  ->  ( A  e.  On  ->  ( ( A  .o  y
)  e.  On  ->  ( A  .o  suc  y
)  e.  On ) ) )
19 vex 3121 . . . . . 6  |-  x  e. 
_V
20 iunon 7021 . . . . . 6  |-  ( ( x  e.  _V  /\  A. y  e.  x  ( A  .o  y )  e.  On )  ->  U_ y  e.  x  ( A  .o  y
)  e.  On )
2119, 20mpan 670 . . . . 5  |-  ( A. y  e.  x  ( A  .o  y )  e.  On  ->  U_ y  e.  x  ( A  .o  y )  e.  On )
22 omlim 7195 . . . . . . 7  |-  ( ( A  e.  On  /\  ( x  e.  _V  /\ 
Lim  x ) )  ->  ( A  .o  x )  =  U_ y  e.  x  ( A  .o  y ) )
2319, 22mpanr1 683 . . . . . 6  |-  ( ( A  e.  On  /\  Lim  x )  ->  ( A  .o  x )  = 
U_ y  e.  x  ( A  .o  y
) )
2423eleq1d 2536 . . . . 5  |-  ( ( A  e.  On  /\  Lim  x )  ->  (
( A  .o  x
)  e.  On  <->  U_ y  e.  x  ( A  .o  y )  e.  On ) )
2521, 24syl5ibr 221 . . . 4  |-  ( ( A  e.  On  /\  Lim  x )  ->  ( A. y  e.  x  ( A  .o  y
)  e.  On  ->  ( A  .o  x )  e.  On ) )
2625expcom 435 . . 3  |-  ( Lim  x  ->  ( A  e.  On  ->  ( A. y  e.  x  ( A  .o  y )  e.  On  ->  ( A  .o  x )  e.  On ) ) )
272, 4, 6, 8, 11, 18, 26tfinds3 6694 . 2  |-  ( B  e.  On  ->  ( A  e.  On  ->  ( A  .o  B )  e.  On ) )
2827impcom 430 1  |-  ( ( A  e.  On  /\  B  e.  On )  ->  ( A  .o  B
)  e.  On )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 369    = wceq 1379    e. wcel 1767   A.wral 2817   _Vcvv 3118   (/)c0 3790   U_ciun 4331   Oncon0 4884   Lim wlim 4885   suc csuc 4886  (class class class)co 6295    +o coa 7139    .o comu 7140
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1601  ax-4 1612  ax-5 1680  ax-6 1719  ax-7 1739  ax-8 1769  ax-9 1771  ax-10 1786  ax-11 1791  ax-12 1803  ax-13 1968  ax-ext 2445  ax-rep 4564  ax-sep 4574  ax-nul 4582  ax-pow 4631  ax-pr 4692  ax-un 6587
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3or 974  df-3an 975  df-tru 1382  df-ex 1597  df-nf 1600  df-sb 1712  df-eu 2279  df-mo 2280  df-clab 2453  df-cleq 2459  df-clel 2462  df-nfc 2617  df-ne 2664  df-ral 2822  df-rex 2823  df-reu 2824  df-rab 2826  df-v 3120  df-sbc 3337  df-csb 3441  df-dif 3484  df-un 3486  df-in 3488  df-ss 3495  df-pss 3497  df-nul 3791  df-if 3946  df-pw 4018  df-sn 4034  df-pr 4036  df-tp 4038  df-op 4040  df-uni 4252  df-iun 4333  df-br 4454  df-opab 4512  df-mpt 4513  df-tr 4547  df-eprel 4797  df-id 4801  df-po 4806  df-so 4807  df-fr 4844  df-we 4846  df-ord 4887  df-on 4888  df-lim 4889  df-suc 4890  df-xp 5011  df-rel 5012  df-cnv 5013  df-co 5014  df-dm 5015  df-rn 5016  df-res 5017  df-ima 5018  df-iota 5557  df-fun 5596  df-fn 5597  df-f 5598  df-f1 5599  df-fo 5600  df-f1o 5601  df-fv 5602  df-ov 6298  df-oprab 6299  df-mpt2 6300  df-om 6696  df-recs 7054  df-rdg 7088  df-oadd 7146  df-omul 7147
This theorem is referenced by:  oecl  7199  omordi  7227  omord2  7228  omcan  7230  omword  7231  omwordri  7233  om00  7236  om00el  7237  omlimcl  7239  odi  7240  omass  7241  oneo  7242  omeulem1  7243  omeulem2  7244  omopth2  7245  oeoelem  7259  oeoe  7260  oeeui  7263  oaabs2  7306  omxpenlem  7630  omxpen  7631  cantnfle  8102  cantnflt  8103  cantnflem1d  8119  cantnflem1  8120  cantnflem3  8122  cantnflem4  8123  cantnfleOLD  8132  cantnfltOLD  8133  cantnflem1dOLD  8142  cantnflem1OLD  8143  cantnflem3OLD  8144  cantnflem4OLD  8145  cnfcomlem  8155  cnfcomlemOLD  8163  xpnum  8344  infxpenc  8407  infxpencOLD  8412  dfac12lem2  8536
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