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Theorem opnneieqvv 46093
Description: The equivalence between neighborhood and open neighborhood. A variant of opnneieqv 46092 with two dummy variables. (Contributed by Zhi Wang, 31-Aug-2024.)
Hypotheses
Ref Expression
opnneir.1 (𝜑𝐽 ∈ Top)
opnneilv.2 ((𝜑𝑦𝑥) → (𝜓𝜒))
opnneil.3 ((𝜑𝑥 = 𝑦) → (𝜓𝜒))
Assertion
Ref Expression
opnneieqvv (𝜑 → (∃𝑥 ∈ ((nei‘𝐽)‘𝑆)𝜓 ↔ ∃𝑦𝐽 (𝑆𝑦𝜒)))
Distinct variable groups:   𝑥,𝐽,𝑦   𝑥,𝑆,𝑦   𝜒,𝑥   𝜑,𝑥,𝑦   𝜓,𝑦
Allowed substitution hints:   𝜓(𝑥)   𝜒(𝑦)

Proof of Theorem opnneieqvv
StepHypRef Expression
1 opnneir.1 . . 3 (𝜑𝐽 ∈ Top)
2 opnneilv.2 . . 3 ((𝜑𝑦𝑥) → (𝜓𝜒))
3 opnneil.3 . . 3 ((𝜑𝑥 = 𝑦) → (𝜓𝜒))
41, 2, 3opnneieqv 46092 . 2 (𝜑 → (∃𝑥 ∈ ((nei‘𝐽)‘𝑆)𝜓 ↔ ∃𝑥𝐽 (𝑆𝑥𝜓)))
53opnneilem 46087 . 2 (𝜑 → (∃𝑥𝐽 (𝑆𝑥𝜓) ↔ ∃𝑦𝐽 (𝑆𝑦𝜒)))
64, 5bitrd 278 1 (𝜑 → (∃𝑥 ∈ ((nei‘𝐽)‘𝑆)𝜓 ↔ ∃𝑦𝐽 (𝑆𝑦𝜒)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 395  wcel 2108  wrex 3064  wss 3883  cfv 6418  Topctop 21950  neicnei 22156
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-rep 5205  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-ral 3068  df-rex 3069  df-reu 3070  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4837  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-id 5480  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-top 21951  df-nei 22157
This theorem is referenced by: (None)
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