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Theorem fconstmpt 4473
Description: Representation of a constant function using the mapping operation. (Note that  x cannot appear free in  B.) (Contributed by NM, 12-Oct-1999.) (Revised by Mario Carneiro, 16-Nov-2013.)
Assertion
Ref Expression
fconstmpt  |-  ( A  X.  { B }
)  =  ( x  e.  A  |->  B )
Distinct variable groups:    x, A    x, B

Proof of Theorem fconstmpt
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 velsn 3458 . . . 4  |-  ( y  e.  { B }  <->  y  =  B )
21anbi2i 445 . . 3  |-  ( ( x  e.  A  /\  y  e.  { B } )  <->  ( x  e.  A  /\  y  =  B ) )
32opabbii 3897 . 2  |-  { <. x ,  y >.  |  ( x  e.  A  /\  y  e.  { B } ) }  =  { <. x ,  y
>.  |  ( x  e.  A  /\  y  =  B ) }
4 df-xp 4434 . 2  |-  ( A  X.  { B }
)  =  { <. x ,  y >.  |  ( x  e.  A  /\  y  e.  { B } ) }
5 df-mpt 3893 . 2  |-  ( x  e.  A  |->  B )  =  { <. x ,  y >.  |  ( x  e.  A  /\  y  =  B ) }
63, 4, 53eqtr4i 2118 1  |-  ( A  X.  { B }
)  =  ( x  e.  A  |->  B )
Colors of variables: wff set class
Syntax hints:    /\ wa 102    = wceq 1289    e. wcel 1438   {csn 3441   {copab 3890    |-> cmpt 3891    X. cxp 4426
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-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070
This theorem depends on definitions:  df-bi 115  df-tru 1292  df-nf 1395  df-sb 1693  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-v 2621  df-sn 3447  df-opab 3892  df-mpt 3893  df-xp 4434
This theorem is referenced by:  fconst  5190  fcoconst  5452  fmptsn  5470  ofc12  5857  caofinvl  5859  xpexgALT  5886  inftonninf  9812  fser0const  9916  nninfall  11546  nninfsellemeqinf  11554  exmidsbthrlem  11558
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