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Theorem dfdm4 4973
Description: Alternate definition of domain. (Contributed by NM, 28-Dec-1996.)
Assertion
Ref Expression
dfdm4  |-  dom  A  =  ran  `' A

Proof of Theorem dfdm4
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 vex 2824 . . . . 5  |-  y  e. 
_V
2 vex 2824 . . . . 5  |-  x  e. 
_V
31, 2brcnv 4963 . . . 4  |-  ( y `' A x  <->  x A
y )
43exbii 1658 . . 3  |-  ( E. y  y `' A x 
<->  E. y  x A y )
54abbii 2354 . 2  |-  { x  |  E. y  y `' A x }  =  { x  |  E. y  x A y }
6 dfrn2 4968 . 2  |-  ran  `' A  =  { x  |  E. y  y `' A x }
7 df-dm 4784 . 2  |-  dom  A  =  { x  |  E. y  x A y }
85, 6, 73eqtr4ri 2270 1  |-  dom  A  =  ran  `' A
Colors of variables:    wff set class
This proof depends on syntax axioms:    = wceq 1402   E.wex 1545   {cab 2224   class class class wbr 4130   `'ccnv 4773   dom cdm 4774   ran crn 4775
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-br 4131  df-opab 4193  df-cnv 4782  df-dm 4784  df-rn 4785
This theorem is used by:  dmcnvcnv  5006  rncnvcnv  5007  rncoeq  5056  cnvimass  5150  cnvimarndm  5151  dminxp  5232  cnvsn0  5256  rnsnopg  5266  dmmpt  5283  dmco  5296  cores2  5300  cnvssrndm  5309  cocnvres  5312  unidmrn  5320  dfdm2  5322  cnvexg  5325  funimacnv  5457  foimacnv  5657  funcocnv2  5664  fimacnv  5837  f1opw2  6296  fopwdom  7136  sbthlemi4  7277  exmidfodomrlemim  7553  hmeores  15416
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