Theorem opelxp 4784

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 4772	. 2 ⊢ (⟨𝐴, 𝐵⟩ ∈ (𝐶 × 𝐷) ↔ ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩)
2		vex 2818	. . . . . . 7 ⊢ 𝑥 ∈ V
3		vex 2818	. . . . . . 7 ⊢ 𝑦 ∈ V
4	2, 3	opth2 4361	. . . . . 6 ⊢ (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ ↔ (𝐴 = 𝑥 ∧ 𝐵 = 𝑦))
5		eleq1 2297	. . . . . . 7 ⊢ (𝐴 = 𝑥 → (𝐴 ∈ 𝐶 ↔ 𝑥 ∈ 𝐶))
6		eleq1 2297	. . . . . . 7 ⊢ (𝐵 = 𝑦 → (𝐵 ∈ 𝐷 ↔ 𝑦 ∈ 𝐷))
7	5, 6	bi2anan9 610	. . . . . 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 2668	. . 3 ⊢ (∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ → (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷))
11		eqid 2234	. . . 4 ⊢ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝐵⟩
12		opeq1 3888	. . . . . 6 ⊢ (𝑥 = 𝐴 → ⟨𝑥, 𝑦⟩ = ⟨𝐴, 𝑦⟩)
13	12	eqeq2d 2246	. . . . 5 ⊢ (𝑥 = 𝐴 → (⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩ ↔ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝑦⟩))
14		opeq2 3889	. . . . . 6 ⊢ (𝑦 = 𝐵 → ⟨𝐴, 𝑦⟩ = ⟨𝐴, 𝐵⟩)
15	14	eqeq2d 2246	. . . . 5 ⊢ (𝑦 = 𝐵 → (⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝑦⟩ ↔ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝐵⟩))
16	13, 15	rspc2ev 2939	. . . 4 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷 ∧ ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝐵⟩) → ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐷 ⟨𝐴, 𝐵⟩ = ⟨𝑥, 𝑦⟩)
17	11, 16	mp3an3 1363	. . 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 1398   ∈ wcel 2205  ∃wrex 2523  ⟨cop 3697   × cxp 4752

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-opab 4177  df-xp 4760

This theorem is referenced by:  brxp  4785  opelxpi  4786  opelxp1  4788  opelxp2  4789  opthprc  4806  elxp3  4809  opeliunxp  4810  optocl  4831  xpiindim  4897  opelres  5048  resiexg  5088  restidsing  5099  codir  5156  qfto  5157  xpmlem  5188  rnxpid  5202  ssrnres  5210  dfco2  5267  relssdmrn  5288  ressn  5308  opelf  5540  fnovex  6091  oprab4  6132  resoprab  6157  elmpocl  6257  fo1stresm  6368  fo2ndresm  6369  dfoprab4  6399  xporderlem  6440  f1od2  6444  brecop  6872  xpdom2  7095  mapunen  7117  djulclb  7359  djuss  7374  enq0enq  7762  enq0sym  7763  enq0tr  7765  nqnq0pi  7769  nnnq0lem1  7777  elinp  7805  genipv  7840  prsrlem1  8073  gt0srpr  8079  opelcn  8157  opelreal  8158  elreal2  8161  frecuzrdgrrn  10794  frec2uzrdg  10795  frecuzrdgrcl  10796  frecuzrdgsuc  10800  frecuzrdgrclt  10801  frecuzrdgsuctlem  10809  fisumcom2  12149  fprodcom2fi  12337  sqpweven  12897  2sqpwodd  12898  phimullem  12947  relelbasov  13359  txuni2  15247  txcnp  15262  txcnmpt  15264  txdis1cn  15269  txlm  15270  xmeterval  15426  limccnp2lem  15667  limccnp2cntop  15668  lgsquadlem1  16076  lgsquadlem2  16077