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Theorem mpt2fun 5747
Description: The maps-to notation for an operation is always a function. (Contributed by Scott Fenton, 21-Mar-2012.)
Hypothesis
Ref Expression
mpt2fun.1  |-  F  =  ( x  e.  A ,  y  e.  B  |->  C )
Assertion
Ref Expression
mpt2fun  |-  Fun  F
Distinct variable group:    x, y
Allowed substitution hints:    A( x, y)    B( x, y)    C( x, y)    F( x, y)

Proof of Theorem mpt2fun
Dummy variables  w  z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqtr3 2107 . . . . . 6  |-  ( ( z  =  C  /\  w  =  C )  ->  z  =  w )
21ad2ant2l 492 . . . . 5  |-  ( ( ( ( x  e.  A  /\  y  e.  B )  /\  z  =  C )  /\  (
( x  e.  A  /\  y  e.  B
)  /\  w  =  C ) )  -> 
z  =  w )
32gen2 1384 . . . 4  |-  A. z A. w ( ( ( ( x  e.  A  /\  y  e.  B
)  /\  z  =  C )  /\  (
( x  e.  A  /\  y  e.  B
)  /\  w  =  C ) )  -> 
z  =  w )
4 eqeq1 2094 . . . . . 6  |-  ( z  =  w  ->  (
z  =  C  <->  w  =  C ) )
54anbi2d 452 . . . . 5  |-  ( z  =  w  ->  (
( ( x  e.  A  /\  y  e.  B )  /\  z  =  C )  <->  ( (
x  e.  A  /\  y  e.  B )  /\  w  =  C
) ) )
65mo4 2009 . . . 4  |-  ( E* z ( ( x  e.  A  /\  y  e.  B )  /\  z  =  C )  <->  A. z A. w ( ( ( ( x  e.  A  /\  y  e.  B
)  /\  z  =  C )  /\  (
( x  e.  A  /\  y  e.  B
)  /\  w  =  C ) )  -> 
z  =  w ) )
73, 6mpbir 144 . . 3  |-  E* z
( ( x  e.  A  /\  y  e.  B )  /\  z  =  C )
87funoprab 5745 . 2  |-  Fun  { <. <. x ,  y
>. ,  z >.  |  ( ( x  e.  A  /\  y  e.  B )  /\  z  =  C ) }
9 mpt2fun.1 . . . 4  |-  F  =  ( x  e.  A ,  y  e.  B  |->  C )
10 df-mpt2 5657 . . . 4  |-  ( x  e.  A ,  y  e.  B  |->  C )  =  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  C
) }
119, 10eqtri 2108 . . 3  |-  F  =  { <. <. x ,  y
>. ,  z >.  |  ( ( x  e.  A  /\  y  e.  B )  /\  z  =  C ) }
1211funeqi 5036 . 2  |-  ( Fun 
F  <->  Fun  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  C
) } )
138, 12mpbir 144 1  |-  Fun  F
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 102   A.wal 1287    = wceq 1289    e. wcel 1438   E*wmo 1949   Fun wfun 5009   {coprab 5653    |-> cmpt2 5654
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-14 1450  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070  ax-sep 3957  ax-pow 4009  ax-pr 4036
This theorem depends on definitions:  df-bi 115  df-3an 926  df-tru 1292  df-nf 1395  df-sb 1693  df-eu 1951  df-mo 1952  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-ral 2364  df-rex 2365  df-v 2621  df-un 3003  df-in 3005  df-ss 3012  df-pw 3431  df-sn 3452  df-pr 3453  df-op 3455  df-br 3846  df-opab 3900  df-id 4120  df-xp 4444  df-rel 4445  df-cnv 4446  df-co 4447  df-fun 5017  df-oprab 5656  df-mpt2 5657
This theorem is referenced by:  elmpt2cl  5842  ofexg  5860  mpt2exxg  5977  mpt2xopn0yelv  6004
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