Theorem opelxp 4753

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 4741	. 2 ⊢ (⟨𝐴, 𝐵⟩ ∈ (𝐶 × 𝐷) ↔ ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩)
2		vex 2803	. . . . . . 7 ⊢ 𝑥 ∈ V
3		vex 2803	. . . . . . 7 ⊢ 𝑦 ∈ V
4	2, 3	opth2 4330	. . . . . 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 3860	. . . . . 6 ⊢ (𝑥 = 𝐴 → ⟨𝑥, 𝑦⟩ = ⟨𝐴, 𝑦⟩)
13	12	eqeq2d 2241	. . . . 5 ⊢ (𝑥 = 𝐴 → (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ ↔ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝑦⟩))
14		opeq2 3861	. . . . . 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 2923	. . . 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 3670   × cxp 4721

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 4205  ax-pow 4262  ax-pr 4297

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 2802  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-opab 4149  df-xp 4729

This theorem is referenced by:  brxp  4754  opelxpi  4755  opelxp1  4757  opelxp2  4758  opthprc  4775  elxp3  4778  opeliunxp  4779  optocl  4800  xpiindim  4865  opelres  5016  resiexg  5056  restidsing  5067  codir  5123  qfto  5124  xpmlem  5155  rnxpid  5169  ssrnres  5177  dfco2  5234  relssdmrn  5255  ressn  5275  opelf  5504  fnovex  6046  oprab4  6087  resoprab  6112  elmpocl  6212  fo1stresm  6319  fo2ndresm  6320  dfoprab4  6350  xporderlem  6391  f1od2  6395  brecop  6789  xpdom2  7010  djulclb  7245  djuss  7260  enq0enq  7641  enq0sym  7642  enq0tr  7644  nqnq0pi  7648  nnnq0lem1  7656  elinp  7684  genipv  7719  prsrlem1  7952  gt0srpr  7958  opelcn  8036  opelreal  8037  elreal2  8040  frecuzrdgrrn  10660  frec2uzrdg  10661  frecuzrdgrcl  10662  frecuzrdgsuc  10666  frecuzrdgrclt  10667  frecuzrdgsuctlem  10675  fisumcom2  11989  fprodcom2fi  12177  sqpweven  12737  2sqpwodd  12738  phimullem  12787  relelbasov  13135  txuni2  14970  txcnp  14985  txcnmpt  14987  txdis1cn  14992  txlm  14993  xmeterval  15149  limccnp2lem  15390  limccnp2cntop  15391  lgsquadlem1  15796  lgsquadlem2  15797