Theorem opelxp 4748

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 4736	. 2 ⊢ (⟨𝐴, 𝐵⟩ ∈ (𝐶 × 𝐷) ↔ ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩)
2		vex 2802	. . . . . . 7 ⊢ 𝑥 ∈ V
3		vex 2802	. . . . . . 7 ⊢ 𝑦 ∈ V
4	2, 3	opth2 4325	. . . . . 6 ⊢ (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ ↔ (𝐴 = 𝑥 ∧ 𝐵 = 𝑦))
5		eleq1 2292	. . . . . . 7 ⊢ (𝐴 = 𝑥 → (𝐴 ∈ 𝐶 ↔ 𝑥 ∈ 𝐶))
6		eleq1 2292	. . . . . . 7 ⊢ (𝐵 = 𝑦 → (𝐵 ∈ 𝐷 ↔ 𝑦 ∈ 𝐷))
7	5, 6	bi2anan9 608	. . . . . 6 ⊢ ((𝐴 = 𝑥 ∧ 𝐵 = 𝑦) → ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) ↔ (𝑥 ∈ 𝐶 ∧ 𝑦 ∈ 𝐷)))
8	4, 7	sylbi 121	. . . . 5 ⊢ (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ → ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) ↔ (𝑥 ∈ 𝐶 ∧ 𝑦 ∈ 𝐷)))
9	8	biimprcd 160	. . . 4 ⊢ ((𝑥 ∈ 𝐶 ∧ 𝑦 ∈ 𝐷) → (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ → (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷)))
10	9	rexlimivv 2654	. . 3 ⊢ (∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ → (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷))
11		eqid 2229	. . . 4 ⊢ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝐵⟩
12		opeq1 3856	. . . . . 6 ⊢ (𝑥 = 𝐴 → ⟨𝑥, 𝑦⟩ = ⟨𝐴, 𝑦⟩)
13	12	eqeq2d 2241	. . . . 5 ⊢ (𝑥 = 𝐴 → (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ ↔ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝑦⟩))
14		opeq2 3857	. . . . . 6 ⊢ (𝑦 = 𝐵 → ⟨𝐴, 𝑦⟩ = ⟨𝐴, 𝐵⟩)
15	14	eqeq2d 2241	. . . . 5 ⊢ (𝑦 = 𝐵 → (⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝑦⟩ ↔ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝐵⟩))
16	13, 15	rspc2ev 2922	. . . 4 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷 ∧ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝐵⟩) → ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩)
17	11, 16	mp3an3 1360	. . 3 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩)
18	10, 17	impbii 126	. 2 ⊢ (∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ ↔ (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷))
19	1, 18	bitri 184	1 ⊢ (⟨𝐴, 𝐵⟩ ∈ (𝐶 × 𝐷) ↔ (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷))

Syntax hints:   ∧ wa 104   ↔ wb 105   = wceq 1395   ∈ wcel 2200  ∃wrex 2509  ⟨cop 3669   × cxp 4716

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4201  ax-pow 4257  ax-pr 4292

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-opab 4145  df-xp 4724

This theorem is referenced by:  brxp  4749  opelxpi  4750  opelxp1  4752  opelxp2  4753  opthprc  4769  elxp3  4772  opeliunxp  4773  optocl  4794  xpiindim  4858  opelres  5009  resiexg  5049  restidsing  5060  codir  5116  qfto  5117  xpmlem  5148  rnxpid  5162  ssrnres  5170  dfco2  5227  relssdmrn  5248  ressn  5268  opelf  5495  fnovex  6033  oprab4  6074  resoprab  6099  elmpocl  6199  fo1stresm  6305  fo2ndresm  6306  dfoprab4  6336  xporderlem  6375  f1od2  6379  brecop  6770  xpdom2  6986  djulclb  7218  djuss  7233  enq0enq  7614  enq0sym  7615  enq0tr  7617  nqnq0pi  7621  nnnq0lem1  7629  elinp  7657  genipv  7692  prsrlem1  7925  gt0srpr  7931  opelcn  8009  opelreal  8010  elreal2  8013  frecuzrdgrrn  10625  frec2uzrdg  10626  frecuzrdgrcl  10627  frecuzrdgsuc  10631  frecuzrdgrclt  10632  frecuzrdgsuctlem  10640  fisumcom2  11944  fprodcom2fi  12132  sqpweven  12692  2sqpwodd  12693  phimullem  12742  relelbasov  13090  txuni2  14924  txcnp  14939  txcnmpt  14941  txdis1cn  14946  txlm  14947  xmeterval  15103  limccnp2lem  15344  limccnp2cntop  15345  lgsquadlem1  15750  lgsquadlem2  15751