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Theorem dmresv 6201
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 6013 . 2 dom (𝐴 ↾ V) = (V ∩ dom 𝐴)
2 incom 4162 . 2 (V ∩ dom 𝐴) = (dom 𝐴 ∩ V)
3 inv1 4355 . 2 (dom 𝐴 ∩ V) = dom 𝐴
41, 2, 33eqtri 2792 1 dom (𝐴 ↾ V) = dom 𝐴
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   = wceq 1570  Vcvv 3457  cin 3905  dom cdm 5663  cres 5665
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-ext 2737  ax-sep 5259  ax-pr 5406
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2744  df-cleq 2757  df-clel 2840  df-ral 3082  df-rex 3092  df-rab 3419  df-v 3459  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-br 5112  df-opab 5176  df-xp 5669  df-dm 5673  df-res 5675
This theorem is used by:  fidomdm  9298  dmttrcl  9697  dmct  10523  dmctOLD  10524  dfsucmap3  39174
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