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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 6009 . 2 dom (𝐴 ↾ V) = (V ∩ dom 𝐴)
2 incom 4109 . 2 (V ∩ dom 𝐴) = (dom 𝐴 ∩ V)
3 inv1 4351 . 2 (dom 𝐴 ∩ V) = dom 𝐴
41, 2, 33eqtri 2790 1 dom (𝐴 ↾ V) = dom 𝐴
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   = wceq 1569  Vcvv 3454   ∩ cin 4092  dom cdm 5655   ↾ cres 5657
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-ext 2735  ax-sep 5252  ax-pr 5395
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2101  df-clab 2742  df-cleq 2755  df-clel 2839  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-br 5107  df-opab 5171  df-xp 5661  df-dm 5665  df-res 5667
This theorem is used by:  fidomdm  9337  dmttrcl  9735  dmct  10615  dmctOLD  10616  dfsucmap3  39541
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