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Theorem dfmpt 5673
Description: Alternate definition for the maps-to notation df-mpt 4052 (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 5320 . 2  |-  ( x  e.  A  |->  B )  =  U_ x  e.  A  ( { x }  X.  { B }
)
2 vex 2733 . . . . 5  |-  x  e. 
_V
3 dfmpt.1 . . . . 5  |-  B  e. 
_V
42, 3xpsn 5672 . . . 4  |-  ( { x }  X.  { B } )  =  { <. x ,  B >. }
54a1i 9 . . 3  |-  ( x  e.  A  ->  ( { x }  X.  { B } )  =  { <. x ,  B >. } )
65iuneq2i 3891 . 2  |-  U_ x  e.  A  ( {
x }  X.  { B } )  =  U_ x  e.  A  { <. x ,  B >. }
71, 6eqtri 2191 1  |-  ( x  e.  A  |->  B )  =  U_ x  e.  A  { <. x ,  B >. }
Colors of variables: wff set class
Syntax hints:    = wceq 1348    e. wcel 2141   _Vcvv 2730   {csn 3583   <.cop 3586   U_ciun 3873    |-> cmpt 4050    X. cxp 4609
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 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194
This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ral 2453  df-rex 2454  df-reu 2455  df-v 2732  df-sbc 2956  df-csb 3050  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-iun 3875  df-br 3990  df-opab 4051  df-mpt 4052  df-id 4278  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-fun 5200  df-fn 5201  df-f 5202  df-f1 5203  df-fo 5204  df-f1o 5205
This theorem is referenced by:  fnasrn  5674  dfmpo  6202
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