Theorem elvv 5707

Description: Membership in universal class of ordered pairs. (Contributed by NM, 4-Jul-1994.)

Assertion

Ref	Expression
elvv	⊢ (𝐴 ∈ (V × V) ↔ ∃𝑥∃𝑦 𝐴 = ⟨𝑥, 𝑦⟩)

Distinct variable group:   𝑥,𝑦,𝐴

Proof of Theorem elvv

Step	Hyp	Ref	Expression
1		elxp 5655	. 2 ⊢ (𝐴 ∈ (V × V) ↔ ∃𝑥∃𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ (𝑥 ∈ V ∧ 𝑦 ∈ V)))
2		vex 3446	. . . . 5 ⊢ 𝑥 ∈ V
3		vex 3446	. . . . 5 ⊢ 𝑦 ∈ V
4	2, 3	pm3.2i 470	. . . 4 ⊢ (𝑥 ∈ V ∧ 𝑦 ∈ V)
5	4	biantru 529	. . 3 ⊢ (𝐴 = ⟨𝑥, 𝑦⟩ ↔ (𝐴 = ⟨𝑥, 𝑦⟩ ∧ (𝑥 ∈ V ∧ 𝑦 ∈ V)))
6	5	2exbii 1851	. 2 ⊢ (∃𝑥∃𝑦 𝐴 = ⟨𝑥, 𝑦⟩ ↔ ∃𝑥∃𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ (𝑥 ∈ V ∧ 𝑦 ∈ V)))
7	1, 6	bitr4i 278	1 ⊢ (𝐴 ∈ (V × V) ↔ ∃𝑥∃𝑦 𝐴 = ⟨𝑥, 𝑦⟩)

Syntax hints:   ↔ wb 206   ∧ wa 395   = wceq 1542  ∃wex 1781   ∈ wcel 2114  Vcvv 3442  ⟨cop 4588   × cxp 5630

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-ext 2709  ax-sep 5243  ax-pr 5379

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-ex 1782  df-sb 2069  df-clab 2716  df-cleq 2729  df-clel 2812  df-rab 3402  df-v 3444  df-un 3908  df-in 3910  df-ss 3920  df-sn 4583  df-pr 4585  df-op 4589  df-opab 5163  df-xp 5638

This theorem is referenced by:  elvvv  5708  elvvuni  5709  elrel  5755  copsex2gb  5763  relop  5807  elreldm  5892  dmsnn0  6173  funsndifnop  7106  1stval2  7960  2ndval2  7961  1st2val  7971  2nd2val  7972  dfopab2  8006  dfoprab3s  8007  dftpos4  8197  tpostpos  8198  fundmen  8980  cnvfi  9112  fundmge2nop0  14437  ssrelf  32705  fineqvac  35294  dfdm5  35989  dfrn5  35990  brtxp2  36095  pprodss4v  36098  brpprod3a  36100  brimg  36151  brxrn2  38635  fun2dmnopgexmpl  47644