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Theorem restrcl 20961
Description: Reverse closure for the subspace topology. (Contributed by Mario Carneiro, 19-Mar-2015.) (Revised by Mario Carneiro, 1-May-2015.)
Assertion
Ref Expression
restrcl ((𝐽t 𝐴) ∈ Top → (𝐽 ∈ V ∧ 𝐴 ∈ V))

Proof of Theorem restrcl
StepHypRef Expression
1 0opn 20709 . . 3 ((𝐽t 𝐴) ∈ Top → ∅ ∈ (𝐽t 𝐴))
2 n0i 3920 . . 3 (∅ ∈ (𝐽t 𝐴) → ¬ (𝐽t 𝐴) = ∅)
31, 2syl 17 . 2 ((𝐽t 𝐴) ∈ Top → ¬ (𝐽t 𝐴) = ∅)
4 restfn 16085 . . . 4 t Fn (V × V)
5 fndm 5990 . . . 4 ( ↾t Fn (V × V) → dom ↾t = (V × V))
64, 5ax-mp 5 . . 3 dom ↾t = (V × V)
76ndmov 6818 . 2 (¬ (𝐽 ∈ V ∧ 𝐴 ∈ V) → (𝐽t 𝐴) = ∅)
83, 7nsyl2 142 1 ((𝐽t 𝐴) ∈ Top → (𝐽 ∈ V ∧ 𝐴 ∈ V))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 384   = wceq 1483  wcel 1990  Vcvv 3200  c0 3915   × cxp 5112  dom cdm 5114   Fn wfn 5883  (class class class)co 6650  t crest 16081  Topctop 20698
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-1st 7168  df-2nd 7169  df-rest 16083  df-top 20699
This theorem is referenced by:  cnrest2r  21091  imacmp  21200  fiuncmp  21207  conncompss  21236  kgeni  21340  kgencmp  21348  kgencmp2  21349
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