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Theorem casef1 7035
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 5376 . . . 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 5376 . . . 4  |-  ( G : B -1-1-> X  ->  G : B --> X )
64, 5syl 14 . . 3  |-  ( ph  ->  G : B --> X )
73, 6casef 7033 . 2  |-  ( ph  -> case ( F ,  G
) : ( A B ) --> X )
8 df-f1 5176 . . . . 5  |-  ( F : A -1-1-> X  <->  ( F : A --> X  /\  Fun  `' F ) )
98simprbi 273 . . . 4  |-  ( F : A -1-1-> X  ->  Fun  `' F )
101, 9syl 14 . . 3  |-  ( ph  ->  Fun  `' F )
11 df-f1 5176 . . . . 5  |-  ( G : B -1-1-> X  <->  ( G : B --> X  /\  Fun  `' G ) )
1211simprbi 273 . . . 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 7034 . 2  |-  ( ph  ->  Fun  `'case ( F ,  G
) )
16 df-f1 5176 . 2  |-  (case ( F ,  G ) : ( A B )
-1-1-> X  <->  (case ( F ,  G ) : ( A B ) --> X  /\  Fun  `'case ( F ,  G
) ) )
177, 15, 16sylanbrc 414 1  |-  ( ph  -> case ( F ,  G
) : ( A B ) -1-1-> X )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1335    i^i cin 3101   (/)c0 3394   `'ccnv 4586   ran crn 4588   Fun wfun 5165   -->wf 5167   -1-1->wf1 5168   ⊔ cdju 6982  casecdjucase 7028
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1427  ax-7 1428  ax-gen 1429  ax-ie1 1473  ax-ie2 1474  ax-8 1484  ax-10 1485  ax-11 1486  ax-i12 1487  ax-bndl 1489  ax-4 1490  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-13 2130  ax-14 2131  ax-ext 2139  ax-sep 4083  ax-nul 4091  ax-pow 4136  ax-pr 4170  ax-un 4394
This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1338  df-fal 1341  df-nf 1441  df-sb 1743  df-eu 2009  df-mo 2010  df-clab 2144  df-cleq 2150  df-clel 2153  df-nfc 2288  df-ne 2328  df-ral 2440  df-rex 2441  df-v 2714  df-sbc 2938  df-dif 3104  df-un 3106  df-in 3108  df-ss 3115  df-nul 3395  df-pw 3545  df-sn 3566  df-pr 3567  df-op 3569  df-uni 3774  df-br 3967  df-opab 4027  df-mpt 4028  df-tr 4064  df-id 4254  df-iord 4327  df-on 4329  df-suc 4332  df-xp 4593  df-rel 4594  df-cnv 4595  df-co 4596  df-dm 4597  df-rn 4598  df-res 4599  df-ima 4600  df-iota 5136  df-fun 5173  df-fn 5174  df-f 5175  df-f1 5176  df-fo 5177  df-f1o 5178  df-fv 5179  df-1st 6089  df-2nd 6090  df-1o 6364  df-dju 6983  df-inl 6992  df-inr 6993  df-case 7029
This theorem is referenced by:  djudom  7038  exmidsbthrlem  13635
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