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Theorem 0rest 17392
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 5262 . . . 4 ∅ ∈ V
2 restval 17389 . . . 4 ((∅ ∈ V ∧ 𝐴 ∈ V) → (∅ ↾t 𝐴) = ran (𝑥 ∈ ∅ ↦ (𝑥𝐴)))
31, 2mpan 690 . . 3 (𝐴 ∈ V → (∅ ↾t 𝐴) = ran (𝑥 ∈ ∅ ↦ (𝑥𝐴)))
4 mpt0 6660 . . . . 5 (𝑥 ∈ ∅ ↦ (𝑥𝐴)) = ∅
54rneqi 5901 . . . 4 ran (𝑥 ∈ ∅ ↦ (𝑥𝐴)) = ran ∅
6 rn0 5889 . . . 4 ran ∅ = ∅
75, 6eqtri 2752 . . 3 ran (𝑥 ∈ ∅ ↦ (𝑥𝐴)) = ∅
83, 7eqtrdi 2780 . 2 (𝐴 ∈ V → (∅ ↾t 𝐴) = ∅)
9 relxp 5656 . . . 4 Rel (V × V)
10 restfn 17387 . . . . . 6 t Fn (V × V)
1110fndmi 6622 . . . . 5 dom ↾t = (V × V)
1211releqi 5740 . . . 4 (Rel dom ↾t ↔ Rel (V × V))
139, 12mpbir 231 . . 3 Rel dom ↾t
1413ovprc2 7427 . 2 𝐴 ∈ V → (∅ ↾t 𝐴) = ∅)
158, 14pm2.61i 182 1 (∅ ↾t 𝐴) = ∅
Colors of variables: wff setvar class
Syntax hints:   = wceq 1540  wcel 2109  Vcvv 3447  cin 3913  c0 4296  cmpt 5188   × cxp 5636  dom cdm 5638  ran crn 5639  Rel wrel 5643  (class class class)co 7387  t crest 17383
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5234  ax-sep 5251  ax-nul 5261  ax-pr 5387  ax-un 7711
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-reu 3355  df-rab 3406  df-v 3449  df-sbc 3754  df-csb 3863  df-dif 3917  df-un 3919  df-in 3921  df-ss 3931  df-nul 4297  df-if 4489  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4872  df-iun 4957  df-br 5108  df-opab 5170  df-mpt 5189  df-id 5533  df-xp 5644  df-rel 5645  df-cnv 5646  df-co 5647  df-dm 5648  df-rn 5649  df-res 5650  df-ima 5651  df-iota 6464  df-fun 6513  df-fn 6514  df-f 6515  df-f1 6516  df-fo 6517  df-f1o 6518  df-fv 6519  df-ov 7390  df-oprab 7391  df-mpo 7392  df-1st 7968  df-2nd 7969  df-rest 17385
This theorem is referenced by:  firest  17395  topnval  17397  resstopn  23073  ussval  24147  bj-rest00  37069
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