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Mirrors > Home > MPE Home > Th. List > dmresv | Structured version Visualization version GIF version |
Description: The domain of a universal restriction. (Contributed by NM, 14-May-2008.) |
Ref | Expression |
---|---|
dmresv | ⊢ dom (𝐴 ↾ V) = dom 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dmres 5877 | . 2 ⊢ dom (𝐴 ↾ V) = (V ∩ dom 𝐴) | |
2 | incom 4180 | . 2 ⊢ (V ∩ dom 𝐴) = (dom 𝐴 ∩ V) | |
3 | inv1 4350 | . 2 ⊢ (dom 𝐴 ∩ V) = dom 𝐴 | |
4 | 1, 2, 3 | 3eqtri 2850 | 1 ⊢ dom (𝐴 ↾ V) = dom 𝐴 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 Vcvv 3496 ∩ cin 3937 dom cdm 5557 ↾ cres 5559 |
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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pr 5332 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-sn 4570 df-pr 4572 df-op 4576 df-br 5069 df-opab 5131 df-xp 5563 df-dm 5567 df-res 5569 |
This theorem is referenced by: fidomdm 8803 dmct 9948 |
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