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Theorem 0rest 17605
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 5260 . . . 4 ∅ ∈ V
2 restval 17602 . . . 4 ((∅ ∈ V ∧ 𝐴 ∈ V) → (∅ ↾t 𝐴) = ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)))
31, 2mpan 703 . . 3 (𝐴 ∈ V → (∅ ↾t 𝐴) = ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)))
4 mpt0 6681 . . . . 5 (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ∅
54rneqi 5918 . . . 4 ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ran ∅
6 rn0 5907 . . . 4 ran ∅ = ∅
75, 6eqtri 2783 . . 3 ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ∅
83, 7eqtrdi 2811 . 2 (𝐴 ∈ V → (∅ ↾t 𝐴) = ∅)
9 relxp 5668 . . . 4 Rel (V × V)
10 restfn 17600 . . . . . 6 ↾t Fn (V × V)
1110fndmi 6643 . . . . 5 dom ↾t = (V × V)
1211releqi 5753 . . . 4 (Rel dom ↾t ↔ Rel (V × V))
139, 12mpbir 234 . . 3 Rel dom ↾t
1413ovprc2 7460 . 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 1569   ∈ wcel 2144  Vcvv 3450   ∩ cin 4089  ∅c0 4278   ↦ cmpt 5185   × cxp 5648  dom cdm 5650  ran crn 5651  Rel wrel 5655  (class class class)co 7420   ↾t crest 17596
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 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pr 5390  ax-un 7751
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-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-f1 6543  df-fo 6544  df-f1o 6545  df-fv 6546  df-ov 7423  df-oprab 7424  df-mpo 7425  df-1st 8001  df-2nd 8002  df-rest 17598
This theorem is used by:  firest  17608  topnval  17610  resstopn  23509  ussval  24583  bj-rest00  38094
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