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Theorem dfafv2 27995
 Description: Alternative definition of ''' using directly. (Contributed by Alexander van der Vekens, 22-Jul-2017.)
Assertion
Ref Expression
dfafv2 ''' defAt

Proof of Theorem dfafv2
Dummy variable is distinct from all other variables.
StepHypRef Expression
1 df-afv 27975 . 2 ''' defAt
2 dffv4 5522 . . . 4
32eqcomi 2287 . . 3
4 ifeq1 3569 . . 3 defAt defAt
53, 4ax-mp 8 . 2 defAt defAt
61, 5eqtri 2303 1 ''' defAt
 Colors of variables: wff set class Syntax hints:   wceq 1623  cab 2269  cvv 2788  cif 3565  csn 3640  cuni 3827  cima 4692  cfv 5255   defAt wdfat 27971  '''cafv 27972 This theorem is referenced by:  afveq12d  27996  nfafv  27999  afvfundmfveq  28001  afvnfundmuv  28002  afvpcfv0  28009 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-ral 2548  df-rex 2549  df-rab 2552  df-v 2790  df-sbc 2992  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-sn 3646  df-pr 3647  df-op 3649  df-uni 3828  df-br 4024  df-opab 4078  df-xp 4695  df-cnv 4697  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fv 5263  df-afv 27975
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