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Theorem 1st2ndb 8054
Description: Reconstruction of an ordered pair in terms of its components. (Contributed by NM, 25-Feb-2014.)
Assertion
Ref Expression
1st2ndb (𝐴 ∈ (V × V) ↔ 𝐴 = ⟨(1st𝐴), (2nd𝐴)⟩)

Proof of Theorem 1st2ndb
StepHypRef Expression
1 1st2nd2 8053 . 2 (𝐴 ∈ (V × V) → 𝐴 = ⟨(1st𝐴), (2nd𝐴)⟩)
2 id 22 . . 3 (𝐴 = ⟨(1st𝐴), (2nd𝐴)⟩ → 𝐴 = ⟨(1st𝐴), (2nd𝐴)⟩)
3 fvex 6919 . . . 4 (1st𝐴) ∈ V
4 fvex 6919 . . . 4 (2nd𝐴) ∈ V
53, 4opelvv 5725 . . 3 ⟨(1st𝐴), (2nd𝐴)⟩ ∈ (V × V)
62, 5eqeltrdi 2849 . 2 (𝐴 = ⟨(1st𝐴), (2nd𝐴)⟩ → 𝐴 ∈ (V × V))
71, 6impbii 209 1 (𝐴 ∈ (V × V) ↔ 𝐴 = ⟨(1st𝐴), (2nd𝐴)⟩)
Colors of variables: wff setvar class
Syntax hints:  wb 206   = wceq 1540  wcel 2108  Vcvv 3480  cop 4632   × cxp 5683  cfv 6561  1st c1st 8012  2nd c2nd 8013
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 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2708  ax-sep 5296  ax-nul 5306  ax-pr 5432  ax-un 7755
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2065  df-mo 2540  df-eu 2569  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2892  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3437  df-v 3482  df-dif 3954  df-un 3956  df-in 3958  df-ss 3968  df-nul 4334  df-if 4526  df-sn 4627  df-pr 4629  df-op 4633  df-uni 4908  df-br 5144  df-opab 5206  df-mpt 5226  df-id 5578  df-xp 5691  df-rel 5692  df-cnv 5693  df-co 5694  df-dm 5695  df-rn 5696  df-iota 6514  df-fun 6563  df-fv 6569  df-1st 8014  df-2nd 8015
This theorem is referenced by:  wlkcpr  29647  wlkeq  29652  opfv  32654  1stpreimas  32715  ovolval2lem  46658  tposideq  48788  fuco22a  49045
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