Theorem opelxp 4442

Description: Ordered pair membership in a cross product. (Contributed by NM, 15-Nov-1994.) (Proof shortened by Andrew Salmon, 12-Aug-2011.) (Revised by Mario Carneiro, 26-Apr-2015.)

Assertion

Ref	Expression
opelxp	⊢ (⟨𝐴, 𝐵⟩ ∈ (𝐶 × 𝐷) ↔ (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷))

Proof of Theorem opelxp

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		elxp2 4431	. 2 ⊢ (⟨𝐴, 𝐵⟩ ∈ (𝐶 × 𝐷) ↔ ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩)
2		vex 2618	. . . . . . 7 ⊢ 𝑥 ∈ V
3		vex 2618	. . . . . . 7 ⊢ 𝑦 ∈ V
4	2, 3	opth2 4043	. . . . . 6 ⊢ (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ ↔ (𝐴 = 𝑥 ∧ 𝐵 = 𝑦))
5		eleq1 2147	. . . . . . 7 ⊢ (𝐴 = 𝑥 → (𝐴 ∈ 𝐶 ↔ 𝑥 ∈ 𝐶))
6		eleq1 2147	. . . . . . 7 ⊢ (𝐵 = 𝑦 → (𝐵 ∈ 𝐷 ↔ 𝑦 ∈ 𝐷))
7	5, 6	bi2anan9 571	. . . . . 6 ⊢ ((𝐴 = 𝑥 ∧ 𝐵 = 𝑦) → ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) ↔ (𝑥 ∈ 𝐶 ∧ 𝑦 ∈ 𝐷)))
8	4, 7	sylbi 119	. . . . 5 ⊢ (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ → ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) ↔ (𝑥 ∈ 𝐶 ∧ 𝑦 ∈ 𝐷)))
9	8	biimprcd 158	. . . 4 ⊢ ((𝑥 ∈ 𝐶 ∧ 𝑦 ∈ 𝐷) → (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ → (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷)))
10	9	rexlimivv 2490	. . 3 ⊢ (∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ → (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷))
11		eqid 2085	. . . 4 ⊢ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝐵⟩
12		opeq1 3607	. . . . . 6 ⊢ (𝑥 = 𝐴 → ⟨𝑥, 𝑦⟩ = ⟨𝐴, 𝑦⟩)
13	12	eqeq2d 2096	. . . . 5 ⊢ (𝑥 = 𝐴 → (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ ↔ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝑦⟩))
14		opeq2 3608	. . . . . 6 ⊢ (𝑦 = 𝐵 → ⟨𝐴, 𝑦⟩ = ⟨𝐴, 𝐵⟩)
15	14	eqeq2d 2096	. . . . 5 ⊢ (𝑦 = 𝐵 → (⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝑦⟩ ↔ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝐵⟩))
16	13, 15	rspc2ev 2728	. . . 4 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷 ∧ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝐵⟩) → ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩)
17	11, 16	mp3an3 1260	. . 3 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩)
18	10, 17	impbii 124	. 2 ⊢ (∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ ↔ (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷))
19	1, 18	bitri 182	1 ⊢ (⟨𝐴, 𝐵⟩ ∈ (𝐶 × 𝐷) ↔ (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷))

Syntax hints:   ∧ wa 102   ↔ wb 103   = wceq 1287   ∈ wcel 1436  ∃wrex 2356  ⟨cop 3434   × cxp 4411

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663  ax-5 1379  ax-7 1380  ax-gen 1381  ax-ie1 1425  ax-ie2 1426  ax-8 1438  ax-10 1439  ax-11 1440  ax-i12 1441  ax-bndl 1442  ax-4 1443  ax-14 1448  ax-17 1462  ax-i9 1466  ax-ial 1470  ax-i5r 1471  ax-ext 2067  ax-sep 3934  ax-pow 3986  ax-pr 4012

This theorem depends on definitions:  df-bi 115  df-3an 924  df-tru 1290  df-nf 1393  df-sb 1690  df-clab 2072  df-cleq 2078  df-clel 2081  df-nfc 2214  df-ral 2360  df-rex 2361  df-v 2617  df-un 2992  df-in 2994  df-ss 3001  df-pw 3417  df-sn 3437  df-pr 3438  df-op 3440  df-opab 3877  df-xp 4419

This theorem is referenced by:  brxp  4443  opelxpi  4444  opelxp1  4445  opelxp2  4446  opthprc  4459  elxp3  4462  opeliunxp  4463  optocl  4484  xpiindim  4543  opelres  4688  resiexg  4726  codir  4789  qfto  4790  xpmlem  4820  rnxpid  4833  ssrnres  4841  dfco2  4898  relssdmrn  4919  ressn  4939  opelf  5148  fnovex  5641  oprab4  5678  resoprab  5700  elmpt2cl  5801  fo1stresm  5891  fo2ndresm  5892  dfoprab4  5921  xporderlem  5955  f1od2  5959  brecop  6336  xpdom2  6501  djulclb  6694  djuss  6708  enq0enq  6937  enq0sym  6938  enq0tr  6940  nqnq0pi  6944  nnnq0lem1  6952  elinp  6980  genipv  7015  prsrlem1  7235  gt0srpr  7241  opelcn  7311  opelreal  7312  elreal2  7315  frecuzrdgrrn  9746  frec2uzrdg  9747  frecuzrdgrcl  9748  frecuzrdgsuc  9752  frecuzrdgrclt  9753  frecuzrdgsuctlem  9761  sqpweven  11078  2sqpwodd  11079  phimullem  11126