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Theorem dmcnvcnv 4917
Description: The domain of the double converse of a class (which doesn't have to be a relation as in dfrel2 5140). (Contributed by NM, 8-Apr-2007.)
Assertion
Ref Expression
dmcnvcnv  |-  dom  `' `' A  =  dom  A

Proof of Theorem dmcnvcnv
StepHypRef Expression
1 dfdm4 4888 . 2  |-  dom  A  =  ran  `' A
2 df-rn 4716 . 2  |-  ran  `' A  =  dom  `' `' A
31, 2eqtr2i 2317 1  |-  dom  `' `' A  =  dom  A
Colors of variables: wff set class
Syntax hints:    = wceq 1632   `'ccnv 4704   dom cdm 4705   ran crn 4706
This theorem is referenced by:  resdm2  5179  f1cnvcnv  5461
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-sep 4157  ax-nul 4165  ax-pr 4230
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-rab 2565  df-v 2803  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3469  df-if 3579  df-sn 3659  df-pr 3660  df-op 3662  df-br 4040  df-opab 4094  df-cnv 4713  df-dm 4715  df-rn 4716
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