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Theorem opnneieqvv 49493
Description: The equivalence between neighborhood and open neighborhood. A variant of opnneieqv 49492 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 49492 . 2 (𝜑 → (∃𝑥 ∈ ((nei‘𝐽)‘𝑆)𝜓 ↔ ∃𝑥𝐽 (𝑆𝑥𝜓)))
53opnneilem 49487 . 2 (𝜑 → (∃𝑥𝐽 (𝑆𝑥𝜓) ↔ ∃𝑦𝐽 (𝑆𝑦𝜒)))
64, 5bitrd 281 1 (𝜑 → (∃𝑥 ∈ ((nei‘𝐽)‘𝑆)𝜓 ↔ ∃𝑦𝐽 (𝑆𝑦𝜒)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 208  wa 399  wcel 2141  wrex 3085  wss 3902  cfv 6515  Topctop 22940  neicnei 23144
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-rep 5224  ax-sep 5243  ax-nul 5253  ax-pow 5319  ax-pr 5387
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3076  df-rex 3086  df-reu 3367  df-rab 3414  df-v 3455  df-sbc 3743  df-csb 3851  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4284  df-if 4478  df-pw 4554  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4863  df-iun 4948  df-br 5098  df-opab 5160  df-mpt 5179  df-id 5538  df-xp 5649  df-rel 5650  df-cnv 5651  df-co 5652  df-dm 5653  df-rn 5654  df-res 5655  df-ima 5656  df-iota 6471  df-fun 6517  df-fn 6518  df-f 6519  df-f1 6520  df-fo 6521  df-f1o 6522  df-fv 6523  df-top 22941  df-nei 23145
This theorem is referenced by: (None)
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