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Theorem casef1 7091
Description: The "case" construction of two injective functions with disjoint ranges is an injective function. (Contributed by BJ, 10-Jul-2022.)
Hypotheses
Ref Expression
casef1.f  |-  ( ph  ->  F : A -1-1-> X
)
casef1.g  |-  ( ph  ->  G : B -1-1-> X
)
casef1.disj  |-  ( ph  ->  ( ran  F  i^i  ran 
G )  =  (/) )
Assertion
Ref Expression
casef1  |-  ( ph  -> case ( F ,  G
) : ( A B ) -1-1-> X )

Proof of Theorem casef1
StepHypRef Expression
1 casef1.f . . . 4  |-  ( ph  ->  F : A -1-1-> X
)
2 f1f 5423 . . . 4  |-  ( F : A -1-1-> X  ->  F : A --> X )
31, 2syl 14 . . 3  |-  ( ph  ->  F : A --> X )
4 casef1.g . . . 4  |-  ( ph  ->  G : B -1-1-> X
)
5 f1f 5423 . . . 4  |-  ( G : B -1-1-> X  ->  G : B --> X )
64, 5syl 14 . . 3  |-  ( ph  ->  G : B --> X )
73, 6casef 7089 . 2  |-  ( ph  -> case ( F ,  G
) : ( A B ) --> X )
8 df-f1 5223 . . . . 5  |-  ( F : A -1-1-> X  <->  ( F : A --> X  /\  Fun  `' F ) )
98simprbi 275 . . . 4  |-  ( F : A -1-1-> X  ->  Fun  `' F )
101, 9syl 14 . . 3  |-  ( ph  ->  Fun  `' F )
11 df-f1 5223 . . . . 5  |-  ( G : B -1-1-> X  <->  ( G : B --> X  /\  Fun  `' G ) )
1211simprbi 275 . . . 4  |-  ( G : B -1-1-> X  ->  Fun  `' G )
134, 12syl 14 . . 3  |-  ( ph  ->  Fun  `' G )
14 casef1.disj . . 3  |-  ( ph  ->  ( ran  F  i^i  ran 
G )  =  (/) )
1510, 13, 14caseinj 7090 . 2  |-  ( ph  ->  Fun  `'case ( F ,  G
) )
16 df-f1 5223 . 2  |-  (case ( F ,  G ) : ( A B )
-1-1-> X  <->  (case ( F ,  G ) : ( A B ) --> X  /\  Fun  `'case ( F ,  G
) ) )
177, 15, 16sylanbrc 417 1  |-  ( ph  -> case ( F ,  G
) : ( A B ) -1-1-> X )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1353    i^i cin 3130   (/)c0 3424   `'ccnv 4627   ran crn 4629   Fun wfun 5212   -->wf 5214   -1-1->wf1 5215   ⊔ cdju 7038  casecdjucase 7084
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-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4123  ax-nul 4131  ax-pow 4176  ax-pr 4211  ax-un 4435
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  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-ne 2348  df-ral 2460  df-rex 2461  df-v 2741  df-sbc 2965  df-dif 3133  df-un 3135  df-in 3137  df-ss 3144  df-nul 3425  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-uni 3812  df-br 4006  df-opab 4067  df-mpt 4068  df-tr 4104  df-id 4295  df-iord 4368  df-on 4370  df-suc 4373  df-xp 4634  df-rel 4635  df-cnv 4636  df-co 4637  df-dm 4638  df-rn 4639  df-res 4640  df-ima 4641  df-iota 5180  df-fun 5220  df-fn 5221  df-f 5222  df-f1 5223  df-fo 5224  df-f1o 5225  df-fv 5226  df-1st 6143  df-2nd 6144  df-1o 6419  df-dju 7039  df-inl 7048  df-inr 7049  df-case 7085
This theorem is referenced by:  djudom  7094  exmidsbthrlem  14809
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