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Theorem djulclALT 14435
Description: Shortening of djulcl 7049 using djucllem 14434. (Contributed by BJ, 4-Jul-2022.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
djulclALT  |-  ( C  e.  A  ->  (
(inl  |`  A ) `  C )  e.  ( A B ) )

Proof of Theorem djulclALT
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 0ex 4130 . . . . 5  |-  (/)  e.  _V
2 df-inl 7045 . . . . 5  |- inl  =  ( x  e.  _V  |->  <. (/)
,  x >. )
31, 2djucllem 14434 . . . 4  |-  ( C  e.  A  ->  (
(inl  |`  A ) `  C )  e.  ( { (/) }  X.  A
) )
43orcd 733 . . 3  |-  ( C  e.  A  ->  (
( (inl  |`  A ) `
 C )  e.  ( { (/) }  X.  A )  \/  (
(inl  |`  A ) `  C )  e.  ( { 1o }  X.  B ) ) )
5 elun 3276 . . 3  |-  ( ( (inl  |`  A ) `  C )  e.  ( ( { (/) }  X.  A )  u.  ( { 1o }  X.  B
) )  <->  ( (
(inl  |`  A ) `  C )  e.  ( { (/) }  X.  A
)  \/  ( (inl  |`  A ) `  C
)  e.  ( { 1o }  X.  B
) ) )
64, 5sylibr 134 . 2  |-  ( C  e.  A  ->  (
(inl  |`  A ) `  C )  e.  ( ( { (/) }  X.  A )  u.  ( { 1o }  X.  B
) ) )
7 df-dju 7036 . 2  |-  ( A B )  =  ( ( { (/) }  X.  A )  u.  ( { 1o }  X.  B
) )
86, 7eleqtrrdi 2271 1  |-  ( C  e.  A  ->  (
(inl  |`  A ) `  C )  e.  ( A B ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    \/ wo 708    e. wcel 2148    u. cun 3127   (/)c0 3422   {csn 3592    X. cxp 4624    |` cres 4628   ` cfv 5216   1oc1o 6409   ⊔ cdju 7035  inlcinl 7043
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 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-14 2151  ax-ext 2159  ax-sep 4121  ax-nul 4129  ax-pow 4174  ax-pr 4209
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2739  df-sbc 2963  df-dif 3131  df-un 3133  df-in 3135  df-ss 3142  df-nul 3423  df-pw 3577  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-br 4004  df-opab 4065  df-mpt 4066  df-id 4293  df-xp 4632  df-rel 4633  df-cnv 4634  df-co 4635  df-dm 4636  df-res 4638  df-iota 5178  df-fun 5218  df-fv 5224  df-dju 7036  df-inl 7045
This theorem is referenced by: (None)
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