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Theorem djulcl 7355
Description: Left closure of disjoint union. (Contributed by Jim Kingdon, 21-Jun-2022.)
Assertion
Ref Expression
djulcl  |-  ( C  e.  A  ->  (inl `  C )  e.  ( A B ) )

Proof of Theorem djulcl
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 elex 2827 . . 3  |-  ( C  e.  A  ->  C  e.  _V )
2 0ex 4242 . . . . 5  |-  (/)  e.  _V
32snid 3725 . . . 4  |-  (/)  e.  { (/)
}
4 opelxpi 4786 . . . 4  |-  ( (
(/)  e.  { (/) }  /\  C  e.  A )  -> 
<. (/) ,  C >.  e.  ( { (/) }  X.  A ) )
53, 4mpan 424 . . 3  |-  ( C  e.  A  ->  <. (/) ,  C >.  e.  ( { (/) }  X.  A ) )
6 opeq2 3889 . . . 4  |-  ( x  =  C  ->  <. (/) ,  x >.  =  <. (/) ,  C >. )
7 df-inl 7351 . . . 4  |- inl  =  ( x  e.  _V  |->  <. (/)
,  x >. )
86, 7fvmptg 5758 . . 3  |-  ( ( C  e.  _V  /\  <. (/)
,  C >.  e.  ( { (/) }  X.  A
) )  ->  (inl `  C )  =  <. (/)
,  C >. )
91, 5, 8syl2anc 411 . 2  |-  ( C  e.  A  ->  (inl `  C )  =  <. (/)
,  C >. )
10 elun1 3390 . . . 4  |-  ( <. (/)
,  C >.  e.  ( { (/) }  X.  A
)  ->  <. (/) ,  C >.  e.  ( ( {
(/) }  X.  A
)  u.  ( { 1o }  X.  B
) ) )
115, 10syl 14 . . 3  |-  ( C  e.  A  ->  <. (/) ,  C >.  e.  ( ( {
(/) }  X.  A
)  u.  ( { 1o }  X.  B
) ) )
12 df-dju 7342 . . 3  |-  ( A B )  =  ( ( { (/) }  X.  A )  u.  ( { 1o }  X.  B
) )
1311, 12eleqtrrdi 2328 . 2  |-  ( C  e.  A  ->  <. (/) ,  C >.  e.  ( A B ) )
149, 13eqeltrd 2311 1  |-  ( C  e.  A  ->  (inl `  C )  e.  ( A B ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1398    e. wcel 2205   _Vcvv 2815    u. cun 3212   (/)c0 3512   {csn 3694   <.cop 3697    X. cxp 4752   ` cfv 5357   1oc1o 6653   ⊔ cdju 7341  inlcinl 7349
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-nul 4241  ax-pow 4292  ax-pr 4327
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-sbc 3046  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-iota 5317  df-fun 5359  df-fv 5365  df-dju 7342  df-inl 7351
This theorem is referenced by:  djulclb  7359  updjudhcoinlf  7384  omp1eomlem  7398  difinfsnlem  7403  difinfsn  7404  ctmlemr  7412  ctm  7413  ctssdclemn0  7414  ctssdccl  7415  fodju0  7451  exmidfodomrlemr  7518  exmidfodomrlemrALT  7519  subctctexmid  16900
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