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Theorem djulcl 7117
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 2774 . . 3  |-  ( C  e.  A  ->  C  e.  _V )
2 0ex 4160 . . . . 5  |-  (/)  e.  _V
32snid 3653 . . . 4  |-  (/)  e.  { (/)
}
4 opelxpi 4695 . . . 4  |-  ( (
(/)  e.  { (/) }  /\  C  e.  A )  -> 
<. (/) ,  C >.  e.  ( { (/) }  X.  A ) )
53, 4mpan 424 . . 3  |-  ( C  e.  A  ->  <. (/) ,  C >.  e.  ( { (/) }  X.  A ) )
6 opeq2 3809 . . . 4  |-  ( x  =  C  ->  <. (/) ,  x >.  =  <. (/) ,  C >. )
7 df-inl 7113 . . . 4  |- inl  =  ( x  e.  _V  |->  <. (/)
,  x >. )
86, 7fvmptg 5637 . . 3  |-  ( ( C  e.  _V  /\  <. (/)
,  C >.  e.  ( { (/) }  X.  A
) )  ->  (inl `  C )  =  <. (/)
,  C >. )
91, 5, 8syl2anc 411 . 2  |-  ( C  e.  A  ->  (inl `  C )  =  <. (/)
,  C >. )
10 elun1 3330 . . . 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 7104 . . 3  |-  ( A B )  =  ( ( { (/) }  X.  A )  u.  ( { 1o }  X.  B
) )
1311, 12eleqtrrdi 2290 . 2  |-  ( C  e.  A  ->  <. (/) ,  C >.  e.  ( A B ) )
149, 13eqeltrd 2273 1  |-  ( C  e.  A  ->  (inl `  C )  e.  ( A B ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1364    e. wcel 2167   _Vcvv 2763    u. cun 3155   (/)c0 3450   {csn 3622   <.cop 3625    X. cxp 4661   ` cfv 5258   1oc1o 6467   ⊔ cdju 7103  inlcinl 7111
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 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-14 2170  ax-ext 2178  ax-sep 4151  ax-nul 4159  ax-pow 4207  ax-pr 4242
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-rex 2481  df-v 2765  df-sbc 2990  df-dif 3159  df-un 3161  df-in 3163  df-ss 3170  df-nul 3451  df-pw 3607  df-sn 3628  df-pr 3629  df-op 3631  df-uni 3840  df-br 4034  df-opab 4095  df-mpt 4096  df-id 4328  df-xp 4669  df-rel 4670  df-cnv 4671  df-co 4672  df-dm 4673  df-iota 5219  df-fun 5260  df-fv 5266  df-dju 7104  df-inl 7113
This theorem is referenced by:  djulclb  7121  updjudhcoinlf  7146  omp1eomlem  7160  difinfsnlem  7165  difinfsn  7166  ctmlemr  7174  ctm  7175  ctssdclemn0  7176  ctssdccl  7177  fodju0  7213  exmidfodomrlemr  7269  exmidfodomrlemrALT  7270  subctctexmid  15645
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