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Theorem dmresv 6156
Description: The domain of a universal restriction. (Contributed by NM, 14-May-2008.)
Assertion
Ref Expression
dmresv dom (𝐴 ↾ V) = dom 𝐴

Proof of Theorem dmresv
StepHypRef Expression
1 dmres 5969 . 2 dom (𝐴 ↾ V) = (V ∩ dom 𝐴)
2 incom 4159 . 2 (V ∩ dom 𝐴) = (dom 𝐴 ∩ V)
3 inv1 4348 . 2 (dom 𝐴 ∩ V) = dom 𝐴
41, 2, 33eqtri 2761 1 dom (𝐴 ↾ V) = dom 𝐴
Colors of variables: wff setvar class
Syntax hints:   = wceq 1541  Vcvv 3438  cin 3898  dom cdm 5622  cres 5624
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-ext 2706  ax-sep 5239  ax-nul 5249  ax-pr 5375
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-clab 2713  df-cleq 2726  df-clel 2809  df-ral 3050  df-rex 3059  df-rab 3398  df-v 3440  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4284  df-if 4478  df-sn 4579  df-pr 4581  df-op 4585  df-br 5097  df-opab 5159  df-xp 5628  df-dm 5632  df-res 5634
This theorem is referenced by:  fidomdm  9232  dmttrcl  9628  dmct  10432  dfsucmap3  38576
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