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Theorem dfmpt 5597
Description: Alternate definition for the maps-to notation df-mpt 3991 (although it requires that  B be a set). (Contributed by NM, 24-Aug-2010.) (Revised by Mario Carneiro, 30-Dec-2016.)
Hypothesis
Ref Expression
dfmpt.1  |-  B  e. 
_V
Assertion
Ref Expression
dfmpt  |-  ( x  e.  A  |->  B )  =  U_ x  e.  A  { <. x ,  B >. }

Proof of Theorem dfmpt
StepHypRef Expression
1 dfmpt3 5245 . 2  |-  ( x  e.  A  |->  B )  =  U_ x  e.  A  ( { x }  X.  { B }
)
2 vex 2689 . . . . 5  |-  x  e. 
_V
3 dfmpt.1 . . . . 5  |-  B  e. 
_V
42, 3xpsn 5596 . . . 4  |-  ( { x }  X.  { B } )  =  { <. x ,  B >. }
54a1i 9 . . 3  |-  ( x  e.  A  ->  ( { x }  X.  { B } )  =  { <. x ,  B >. } )
65iuneq2i 3831 . 2  |-  U_ x  e.  A  ( {
x }  X.  { B } )  =  U_ x  e.  A  { <. x ,  B >. }
71, 6eqtri 2160 1  |-  ( x  e.  A  |->  B )  =  U_ x  e.  A  { <. x ,  B >. }
Colors of variables: wff set class
Syntax hints:    = wceq 1331    e. wcel 1480   _Vcvv 2686   {csn 3527   <.cop 3530   U_ciun 3813    |-> cmpt 3989    X. cxp 4537
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-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-sep 4046  ax-pow 4098  ax-pr 4131
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ral 2421  df-rex 2422  df-reu 2423  df-v 2688  df-sbc 2910  df-csb 3004  df-un 3075  df-in 3077  df-ss 3084  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-iun 3815  df-br 3930  df-opab 3990  df-mpt 3991  df-id 4215  df-xp 4545  df-rel 4546  df-cnv 4547  df-co 4548  df-dm 4549  df-rn 4550  df-fun 5125  df-fn 5126  df-f 5127  df-f1 5128  df-fo 5129  df-f1o 5130
This theorem is referenced by:  fnasrn  5598  dfmpo  6120
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