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Theorem 0rest 17629
Description: Value of the structure restriction when the topology input is empty. (Contributed by Mario Carneiro, 13-Aug-2015.)
Assertion
Ref Expression
0rest (∅ ↾t 𝐴) = ∅

Proof of Theorem 0rest
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 0ex 5264 . . . 4 ∅ ∈ V
2 restval 17626 . . . 4 ((∅ ∈ V ∧ 𝐴 ∈ V) → (∅ ↾t 𝐴) = ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)))
31, 2mpan 703 . . 3 (𝐴 ∈ V → (∅ ↾t 𝐴) = ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)))
4 mpt0 6703 . . . . 5 (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ∅
54rneqi 5926 . . . 4 ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ran ∅
6 rn0 5915 . . . 4 ran ∅ = ∅
75, 6eqtri 2786 . . 3 ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ∅
83, 7eqtrdi 2814 . 2 (𝐴 ∈ V → (∅ ↾t 𝐴) = ∅)
9 relxp 5673 . . . 4 Rel (V × V)
10 restfn 17624 . . . . . 6 ↾t Fn (V × V)
1110fndmi 6665 . . . . 5 dom ↾t = (V × V)
1211releqi 5759 . . . 4 (Rel dom ↾t ↔ Rel (V × V))
139, 12mpbir 234 . . 3 Rel dom ↾t
1413ovprc2 7483 . 2 (¬ 𝐴 ∈ V → (∅ ↾t 𝐴) = ∅)
158, 14pm2.61i 184 1 (∅ ↾t 𝐴) = ∅
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   = wceq 1570   ∈ wcel 2147  Vcvv 3454   ∩ cin 4092  ∅c0 4281   ↦ cmpt 5189   × cxp 5653  dom cdm 5655  ran crn 5656  Rel wrel 5660  (class class class)co 7443   ↾t crest 17620
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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5235  ax-sep 5252  ax-nul 5263  ax-pr 5395  ax-un 7775
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-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  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-uni 4871  df-iun 4956  df-br 5107  df-opab 5171  df-mpt 5190  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-iota 6512  df-fun 6560  df-fn 6561  df-f 6562  df-f1 6563  df-fo 6564  df-f1o 6565  df-fv 6566  df-ov 7446  df-oprab 7447  df-mpo 7448  df-1st 8025  df-2nd 8026  df-rest 17622
This theorem is used by:  firest  17632  topnval  17634  resstopn  23534  ussval  24608  bj-rest00  38193
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