Theorem xpiindim 4873

Description: Distributive law for cross product over indexed intersection. (Contributed by Jim Kingdon, 7-Dec-2018.)

Assertion

Ref	Expression
xpiindim	⊢ (∃𝑦 𝑦 ∈ 𝐴 → (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) = ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵))

Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐶,𝑦

Allowed substitution hints:   𝐵(𝑥,𝑦)

Proof of Theorem xpiindim

Dummy variables 𝑧 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		relxp 4841	. . . . . 6 ⊢ Rel (𝐶 × 𝐵)
2	1	rgenw 2588	. . . . 5 ⊢ ∀𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵)
3		r19.2m 3583	. . . . 5 ⊢ ((∃𝑦 𝑦 ∈ 𝐴 ∧ ∀𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵)) → ∃𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵))
4	2, 3	mpan2 425	. . . 4 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → ∃𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵))
5		reliin 4855	. . . 4 ⊢ (∃𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵) → Rel ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵))
6	4, 5	syl 14	. . 3 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → Rel ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵))
7		relxp 4841	. . 3 ⊢ Rel (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵)
8	6, 7	jctil 312	. 2 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → (Rel (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) ∧ Rel ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵)))
9		eleq1w 2292	. . . . . . . 8 ⊢ (𝑥 = 𝑦 → (𝑥 ∈ 𝐴 ↔ 𝑦 ∈ 𝐴))
10	9	cbvexv 1967	. . . . . . 7 ⊢ (∃𝑥 𝑥 ∈ 𝐴 ↔ ∃𝑦 𝑦 ∈ 𝐴)
11		r19.28mv 3589	. . . . . . 7 ⊢ (∃𝑥 𝑥 ∈ 𝐴 → (∀𝑥 ∈ 𝐴 (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ 𝐵) ↔ (𝑤 ∈ 𝐶 ∧ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵)))
12	10, 11	sylbir 135	. . . . . 6 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → (∀𝑥 ∈ 𝐴 (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ 𝐵) ↔ (𝑤 ∈ 𝐶 ∧ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵)))
13	12	bicomd 141	. . . . 5 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → ((𝑤 ∈ 𝐶 ∧ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵) ↔ ∀𝑥 ∈ 𝐴 (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ 𝐵)))
14		eliin 3980	. . . . . . 7 ⊢ (𝑧 ∈ V → (𝑧 ∈ ∩ 𝑥 ∈ 𝐴 𝐵 ↔ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵))
15	14	elv 2807	. . . . . 6 ⊢ (𝑧 ∈ ∩ 𝑥 ∈ 𝐴 𝐵 ↔ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵)
16	15	anbi2i 457	. . . . 5 ⊢ ((𝑤 ∈ 𝐶 ∧ 𝑧 ∈ ∩ 𝑥 ∈ 𝐴 𝐵) ↔ (𝑤 ∈ 𝐶 ∧ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵))
17		opelxp 4761	. . . . . 6 ⊢ (⟨𝑤, 𝑧⟩ ∈ (𝐶 × 𝐵) ↔ (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ 𝐵))
18	17	ralbii 2539	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 ⟨𝑤, 𝑧⟩ ∈ (𝐶 × 𝐵) ↔ ∀𝑥 ∈ 𝐴 (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ 𝐵))
19	13, 16, 18	3bitr4g 223	. . . 4 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → ((𝑤 ∈ 𝐶 ∧ 𝑧 ∈ ∩ 𝑥 ∈ 𝐴 𝐵) ↔ ∀𝑥 ∈ 𝐴 ⟨𝑤, 𝑧⟩ ∈ (𝐶 × 𝐵)))
20		opelxp 4761	. . . 4 ⊢ (⟨𝑤, 𝑧⟩ ∈ (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) ↔ (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ ∩ 𝑥 ∈ 𝐴 𝐵))
21		vex 2806	. . . . . 6 ⊢ 𝑤 ∈ V
22		vex 2806	. . . . . 6 ⊢ 𝑧 ∈ V
23	21, 22	opex 4327	. . . . 5 ⊢ ⟨𝑤, 𝑧⟩ ∈ V
24		eliin 3980	. . . . 5 ⊢ (⟨𝑤, 𝑧⟩ ∈ V → (⟨𝑤, 𝑧⟩ ∈ ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵) ↔ ∀𝑥 ∈ 𝐴 ⟨𝑤, 𝑧⟩ ∈ (𝐶 × 𝐵)))
25	23, 24	ax-mp 5	. . . 4 ⊢ (⟨𝑤, 𝑧⟩ ∈ ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵) ↔ ∀𝑥 ∈ 𝐴 ⟨𝑤, 𝑧⟩ ∈ (𝐶 × 𝐵))
26	19, 20, 25	3bitr4g 223	. . 3 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → (⟨𝑤, 𝑧⟩ ∈ (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) ↔ ⟨𝑤, 𝑧⟩ ∈ ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵)))
27	26	eqrelrdv2 4831	. 2 ⊢ (((Rel (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) ∧ Rel ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵)) ∧ ∃𝑦 𝑦 ∈ 𝐴) → (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) = ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵))
28	8, 27	mpancom 422	1 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) = ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   = wceq 1398  ∃wex 1541   ∈ wcel 2202  ∀wral 2511  ∃wrex 2512  Vcvv 2803  ⟨cop 3676  ∩ ciin 3976   × cxp 4729  Rel wrel 4736

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 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-iin 3978  df-opab 4156  df-xp 4737  df-rel 4738

This theorem is referenced by:  xpriindim  4874