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Theorem fun2 5549
Description: The union of two functions with disjoint domains. (Contributed by Mario Carneiro, 12-Mar-2015.)
Assertion
Ref Expression
fun2  |-  ( ( ( F : A --> C  /\  G : B --> C )  /\  ( A  i^i  B )  =  (/) )  ->  ( F  u.  G ) : ( A  u.  B
) --> C )

Proof of Theorem fun2
StepHypRef Expression
1 fun 5548 . 2  |-  ( ( ( F : A --> C  /\  G : B --> C )  /\  ( A  i^i  B )  =  (/) )  ->  ( F  u.  G ) : ( A  u.  B
) --> ( C  u.  C ) )
2 unidm 3434 . . 3  |-  ( C  u.  C )  =  C
3 feq3 5519 . . 3  |-  ( ( C  u.  C )  =  C  ->  (
( F  u.  G
) : ( A  u.  B ) --> ( C  u.  C )  <-> 
( F  u.  G
) : ( A  u.  B ) --> C ) )
42, 3ax-mp 8 . 2  |-  ( ( F  u.  G ) : ( A  u.  B ) --> ( C  u.  C )  <->  ( F  u.  G ) : ( A  u.  B ) --> C )
51, 4sylib 189 1  |-  ( ( ( F : A --> C  /\  G : B --> C )  /\  ( A  i^i  B )  =  (/) )  ->  ( F  u.  G ) : ( A  u.  B
) --> C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 177    /\ wa 359    = wceq 1649    u. cun 3262    i^i cin 3263   (/)c0 3572   -->wf 5391
This theorem is referenced by:  fresaun  5555  mapunen  7213  ac6sfi  7288  axdc3lem4  8267  fseq1p1m1  11053  uhgraun  21214  umgraun  21231  eupap1  21547  axlowdimlem5  25600  axlowdimlem7  25602
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1661  ax-8 1682  ax-14 1721  ax-6 1736  ax-7 1741  ax-11 1753  ax-12 1939  ax-ext 2369  ax-sep 4272  ax-nul 4280  ax-pr 4345
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2243  df-mo 2244  df-clab 2375  df-cleq 2381  df-clel 2384  df-nfc 2513  df-ne 2553  df-ral 2655  df-rab 2659  df-v 2902  df-dif 3267  df-un 3269  df-in 3271  df-ss 3278  df-nul 3573  df-if 3684  df-sn 3764  df-pr 3765  df-op 3767  df-br 4155  df-opab 4209  df-id 4440  df-rel 4826  df-cnv 4827  df-co 4828  df-dm 4829  df-rn 4830  df-fun 5397  df-fn 5398  df-f 5399
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