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Theorem restcnrm 21147
Description: A subspace of a completely normal space is completely normal. (Contributed by Mario Carneiro, 26-Aug-2015.)
Assertion
Ref Expression
restcnrm ((𝐽 ∈ CNrm ∧ 𝐴𝑉) → (𝐽t 𝐴) ∈ CNrm)

Proof of Theorem restcnrm
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 eqid 2620 . . 3 𝐽 = 𝐽
21restin 20951 . 2 ((𝐽 ∈ CNrm ∧ 𝐴𝑉) → (𝐽t 𝐴) = (𝐽t (𝐴 𝐽)))
3 simpll 789 . . . . . 6 (((𝐽 ∈ CNrm ∧ 𝐴𝑉) ∧ 𝑥 ∈ 𝒫 (𝐴 𝐽)) → 𝐽 ∈ CNrm)
4 elpwi 4159 . . . . . . 7 (𝑥 ∈ 𝒫 (𝐴 𝐽) → 𝑥 ⊆ (𝐴 𝐽))
54adantl 482 . . . . . 6 (((𝐽 ∈ CNrm ∧ 𝐴𝑉) ∧ 𝑥 ∈ 𝒫 (𝐴 𝐽)) → 𝑥 ⊆ (𝐴 𝐽))
6 inex1g 4792 . . . . . . 7 (𝐴𝑉 → (𝐴 𝐽) ∈ V)
76ad2antlr 762 . . . . . 6 (((𝐽 ∈ CNrm ∧ 𝐴𝑉) ∧ 𝑥 ∈ 𝒫 (𝐴 𝐽)) → (𝐴 𝐽) ∈ V)
8 restabs 20950 . . . . . 6 ((𝐽 ∈ CNrm ∧ 𝑥 ⊆ (𝐴 𝐽) ∧ (𝐴 𝐽) ∈ V) → ((𝐽t (𝐴 𝐽)) ↾t 𝑥) = (𝐽t 𝑥))
93, 5, 7, 8syl3anc 1324 . . . . 5 (((𝐽 ∈ CNrm ∧ 𝐴𝑉) ∧ 𝑥 ∈ 𝒫 (𝐴 𝐽)) → ((𝐽t (𝐴 𝐽)) ↾t 𝑥) = (𝐽t 𝑥))
10 cnrmi 21145 . . . . . 6 ((𝐽 ∈ CNrm ∧ 𝑥 ∈ 𝒫 (𝐴 𝐽)) → (𝐽t 𝑥) ∈ Nrm)
1110adantlr 750 . . . . 5 (((𝐽 ∈ CNrm ∧ 𝐴𝑉) ∧ 𝑥 ∈ 𝒫 (𝐴 𝐽)) → (𝐽t 𝑥) ∈ Nrm)
129, 11eqeltrd 2699 . . . 4 (((𝐽 ∈ CNrm ∧ 𝐴𝑉) ∧ 𝑥 ∈ 𝒫 (𝐴 𝐽)) → ((𝐽t (𝐴 𝐽)) ↾t 𝑥) ∈ Nrm)
1312ralrimiva 2963 . . 3 ((𝐽 ∈ CNrm ∧ 𝐴𝑉) → ∀𝑥 ∈ 𝒫 (𝐴 𝐽)((𝐽t (𝐴 𝐽)) ↾t 𝑥) ∈ Nrm)
14 cnrmtop 21122 . . . . . . 7 (𝐽 ∈ CNrm → 𝐽 ∈ Top)
1514adantr 481 . . . . . 6 ((𝐽 ∈ CNrm ∧ 𝐴𝑉) → 𝐽 ∈ Top)
161toptopon 20703 . . . . . 6 (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘ 𝐽))
1715, 16sylib 208 . . . . 5 ((𝐽 ∈ CNrm ∧ 𝐴𝑉) → 𝐽 ∈ (TopOn‘ 𝐽))
18 inss2 3826 . . . . 5 (𝐴 𝐽) ⊆ 𝐽
19 resttopon 20946 . . . . 5 ((𝐽 ∈ (TopOn‘ 𝐽) ∧ (𝐴 𝐽) ⊆ 𝐽) → (𝐽t (𝐴 𝐽)) ∈ (TopOn‘(𝐴 𝐽)))
2017, 18, 19sylancl 693 . . . 4 ((𝐽 ∈ CNrm ∧ 𝐴𝑉) → (𝐽t (𝐴 𝐽)) ∈ (TopOn‘(𝐴 𝐽)))
21 iscnrm2 21123 . . . 4 ((𝐽t (𝐴 𝐽)) ∈ (TopOn‘(𝐴 𝐽)) → ((𝐽t (𝐴 𝐽)) ∈ CNrm ↔ ∀𝑥 ∈ 𝒫 (𝐴 𝐽)((𝐽t (𝐴 𝐽)) ↾t 𝑥) ∈ Nrm))
2220, 21syl 17 . . 3 ((𝐽 ∈ CNrm ∧ 𝐴𝑉) → ((𝐽t (𝐴 𝐽)) ∈ CNrm ↔ ∀𝑥 ∈ 𝒫 (𝐴 𝐽)((𝐽t (𝐴 𝐽)) ↾t 𝑥) ∈ Nrm))
2313, 22mpbird 247 . 2 ((𝐽 ∈ CNrm ∧ 𝐴𝑉) → (𝐽t (𝐴 𝐽)) ∈ CNrm)
242, 23eqeltrd 2699 1 ((𝐽 ∈ CNrm ∧ 𝐴𝑉) → (𝐽t 𝐴) ∈ CNrm)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 384   = wceq 1481  wcel 1988  wral 2909  Vcvv 3195  cin 3566  wss 3567  𝒫 cpw 4149   cuni 4427  cfv 5876  (class class class)co 6635  t crest 16062  Topctop 20679  TopOnctopon 20696  Nrmcnrm 21095  CNrmccnrm 21096
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1720  ax-4 1735  ax-5 1837  ax-6 1886  ax-7 1933  ax-8 1990  ax-9 1997  ax-10 2017  ax-11 2032  ax-12 2045  ax-13 2244  ax-ext 2600  ax-rep 4762  ax-sep 4772  ax-nul 4780  ax-pow 4834  ax-pr 4897  ax-un 6934
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1484  df-ex 1703  df-nf 1708  df-sb 1879  df-eu 2472  df-mo 2473  df-clab 2607  df-cleq 2613  df-clel 2616  df-nfc 2751  df-ne 2792  df-ral 2914  df-rex 2915  df-reu 2916  df-rab 2918  df-v 3197  df-sbc 3430  df-csb 3527  df-dif 3570  df-un 3572  df-in 3574  df-ss 3581  df-pss 3583  df-nul 3908  df-if 4078  df-pw 4151  df-sn 4169  df-pr 4171  df-tp 4173  df-op 4175  df-uni 4428  df-int 4467  df-iun 4513  df-br 4645  df-opab 4704  df-mpt 4721  df-tr 4744  df-id 5014  df-eprel 5019  df-po 5025  df-so 5026  df-fr 5063  df-we 5065  df-xp 5110  df-rel 5111  df-cnv 5112  df-co 5113  df-dm 5114  df-rn 5115  df-res 5116  df-ima 5117  df-pred 5668  df-ord 5714  df-on 5715  df-lim 5716  df-suc 5717  df-iota 5839  df-fun 5878  df-fn 5879  df-f 5880  df-f1 5881  df-fo 5882  df-f1o 5883  df-fv 5884  df-ov 6638  df-oprab 6639  df-mpt2 6640  df-om 7051  df-1st 7153  df-2nd 7154  df-wrecs 7392  df-recs 7453  df-rdg 7491  df-oadd 7549  df-er 7727  df-en 7941  df-fin 7944  df-fi 8302  df-rest 16064  df-topgen 16085  df-top 20680  df-topon 20697  df-bases 20731  df-cnrm 21103
This theorem is referenced by: (None)
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