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Theorem dfima3 5071
Description: Alternate definition of image. Compare definition (d) of [Enderton] p. 44. (Contributed by NM, 14-Aug-1994.) (Proof shortened by Andrew Salmon, 27-Aug-2011.)
Assertion
Ref Expression
dfima3  |-  ( A
" B )  =  { y  |  E. x ( x  e.  B  /\  <. x ,  y >.  e.  A
) }
Distinct variable groups:    x, y, A   
x, B, y

Proof of Theorem dfima3
StepHypRef Expression
1 dfima2 5070 . 2  |-  ( A
" B )  =  { y  |  E. x  e.  B  x A y }
2 df-br 4084 . . . . 5  |-  ( x A y  <->  <. x ,  y >.  e.  A
)
32rexbii 2537 . . . 4  |-  ( E. x  e.  B  x A y  <->  E. x  e.  B  <. x ,  y >.  e.  A
)
4 df-rex 2514 . . . 4  |-  ( E. x  e.  B  <. x ,  y >.  e.  A  <->  E. x ( x  e.  B  /\  <. x ,  y >.  e.  A
) )
53, 4bitri 184 . . 3  |-  ( E. x  e.  B  x A y  <->  E. x
( x  e.  B  /\  <. x ,  y
>.  e.  A ) )
65abbii 2345 . 2  |-  { y  |  E. x  e.  B  x A y }  =  { y  |  E. x ( x  e.  B  /\  <.
x ,  y >.  e.  A ) }
71, 6eqtri 2250 1  |-  ( A
" B )  =  { y  |  E. x ( x  e.  B  /\  <. x ,  y >.  e.  A
) }
Colors of variables: wff set class
Syntax hints:    /\ wa 104    = wceq 1395   E.wex 1538    e. wcel 2200   {cab 2215   E.wrex 2509   <.cop 3669   class class class wbr 4083   "cima 4722
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4258  ax-pr 4293
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-br 4084  df-opab 4146  df-xp 4725  df-cnv 4727  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732
This theorem is referenced by:  imadmrn  5078  imassrn  5079  imai  5084
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