Users' Mathboxes Mathbox for Zhi Wang < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  opnneieqvv Structured version   Visualization version   GIF version

Theorem opnneieqvv 48873
Description: The equivalence between neighborhood and open neighborhood. A variant of opnneieqv 48872 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 48872 . 2 (𝜑 → (∃𝑥 ∈ ((nei‘𝐽)‘𝑆)𝜓 ↔ ∃𝑥𝐽 (𝑆𝑥𝜓)))
53opnneilem 48867 . 2 (𝜑 → (∃𝑥𝐽 (𝑆𝑥𝜓) ↔ ∃𝑦𝐽 (𝑆𝑦𝜒)))
64, 5bitrd 279 1 (𝜑 → (∃𝑥 ∈ ((nei‘𝐽)‘𝑆)𝜓 ↔ ∃𝑦𝐽 (𝑆𝑦𝜒)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  wcel 2109  wrex 3053  wss 3911  cfv 6499  Topctop 22756  neicnei 22960
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5229  ax-sep 5246  ax-nul 5256  ax-pow 5315  ax-pr 5382
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-reu 3352  df-rab 3403  df-v 3446  df-sbc 3751  df-csb 3860  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4293  df-if 4485  df-pw 4561  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4868  df-iun 4953  df-br 5103  df-opab 5165  df-mpt 5184  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-iota 6452  df-fun 6501  df-fn 6502  df-f 6503  df-f1 6504  df-fo 6505  df-f1o 6506  df-fv 6507  df-top 22757  df-nei 22961
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator