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Theorem restid2 16138
Description: The subspace topology over a subset of the base set is the original topology. (Contributed by Mario Carneiro, 13-Aug-2015.)
Assertion
Ref Expression
restid2 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → (𝐽t 𝐴) = 𝐽)

Proof of Theorem restid2
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 pwexg 4880 . . . . 5 (𝐴𝑉 → 𝒫 𝐴 ∈ V)
21adantr 480 . . . 4 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → 𝒫 𝐴 ∈ V)
3 simpr 476 . . . 4 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → 𝐽 ⊆ 𝒫 𝐴)
42, 3ssexd 4838 . . 3 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → 𝐽 ∈ V)
5 simpl 472 . . 3 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → 𝐴𝑉)
6 restval 16134 . . 3 ((𝐽 ∈ V ∧ 𝐴𝑉) → (𝐽t 𝐴) = ran (𝑥𝐽 ↦ (𝑥𝐴)))
74, 5, 6syl2anc 694 . 2 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → (𝐽t 𝐴) = ran (𝑥𝐽 ↦ (𝑥𝐴)))
83sselda 3636 . . . . . . . 8 (((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) ∧ 𝑥𝐽) → 𝑥 ∈ 𝒫 𝐴)
98elpwid 4203 . . . . . . 7 (((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) ∧ 𝑥𝐽) → 𝑥𝐴)
10 df-ss 3621 . . . . . . 7 (𝑥𝐴 ↔ (𝑥𝐴) = 𝑥)
119, 10sylib 208 . . . . . 6 (((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) ∧ 𝑥𝐽) → (𝑥𝐴) = 𝑥)
1211mpteq2dva 4777 . . . . 5 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → (𝑥𝐽 ↦ (𝑥𝐴)) = (𝑥𝐽𝑥))
13 mptresid 5491 . . . . 5 (𝑥𝐽𝑥) = ( I ↾ 𝐽)
1412, 13syl6eq 2701 . . . 4 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → (𝑥𝐽 ↦ (𝑥𝐴)) = ( I ↾ 𝐽))
1514rneqd 5385 . . 3 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → ran (𝑥𝐽 ↦ (𝑥𝐴)) = ran ( I ↾ 𝐽))
16 rnresi 5514 . . 3 ran ( I ↾ 𝐽) = 𝐽
1715, 16syl6eq 2701 . 2 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → ran (𝑥𝐽 ↦ (𝑥𝐴)) = 𝐽)
187, 17eqtrd 2685 1 ((𝐴𝑉𝐽 ⊆ 𝒫 𝐴) → (𝐽t 𝐴) = 𝐽)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 383   = wceq 1523  wcel 2030  Vcvv 3231  cin 3606  wss 3607  𝒫 cpw 4191  cmpt 4762   I cid 5052  ran crn 5144  cres 5145  (class class class)co 6690  t crest 16128
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-rest 16130
This theorem is referenced by:  restid  16141  topnid  16143  ssufl  21769
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