Theorem xpiindim 4473

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 4447	. . . . . 6 ⊢ Rel (𝐶 × 𝐵)
2	1	rgenw 2376	. . . . 5 ⊢ ∀𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵)
3		eleq1 2100	. . . . . . 7 ⊢ (𝑥 = 𝑦 → (𝑥 ∈ 𝐴 ↔ 𝑦 ∈ 𝐴))
4	3	cbvexv 1795	. . . . . 6 ⊢ (∃𝑥 𝑥 ∈ 𝐴 ↔ ∃𝑦 𝑦 ∈ 𝐴)
5		r19.2m 3309	. . . . . 6 ⊢ ((∃𝑥 𝑥 ∈ 𝐴 ∧ ∀𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵)) → ∃𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵))
6	4, 5	sylanbr 269	. . . . 5 ⊢ ((∃𝑦 𝑦 ∈ 𝐴 ∧ ∀𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵)) → ∃𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵))
7	2, 6	mpan2 401	. . . 4 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → ∃𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵))
8		reliin 4459	. . . 4 ⊢ (∃𝑥 ∈ 𝐴 Rel (𝐶 × 𝐵) → Rel ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵))
9	7, 8	syl 14	. . 3 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → Rel ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵))
10		relxp 4447	. . 3 ⊢ Rel (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵)
11	9, 10	jctil 295	. 2 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → (Rel (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) ∧ Rel ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵)))
12		r19.28mv 3314	. . . . . . 7 ⊢ (∃𝑥 𝑥 ∈ 𝐴 → (∀𝑥 ∈ 𝐴 (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ 𝐵) ↔ (𝑤 ∈ 𝐶 ∧ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵)))
13	4, 12	sylbir 125	. . . . . 6 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → (∀𝑥 ∈ 𝐴 (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ 𝐵) ↔ (𝑤 ∈ 𝐶 ∧ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵)))
14	13	bicomd 129	. . . . 5 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → ((𝑤 ∈ 𝐶 ∧ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵) ↔ ∀𝑥 ∈ 𝐴 (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ 𝐵)))
15		vex 2560	. . . . . . 7 ⊢ 𝑧 ∈ V
16		eliin 3662	. . . . . . 7 ⊢ (𝑧 ∈ V → (𝑧 ∈ ∩ 𝑥 ∈ 𝐴 𝐵 ↔ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵))
17	15, 16	ax-mp 7	. . . . . 6 ⊢ (𝑧 ∈ ∩ 𝑥 ∈ 𝐴 𝐵 ↔ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵)
18	17	anbi2i 430	. . . . 5 ⊢ ((𝑤 ∈ 𝐶 ∧ 𝑧 ∈ ∩ 𝑥 ∈ 𝐴 𝐵) ↔ (𝑤 ∈ 𝐶 ∧ ∀𝑥 ∈ 𝐴 𝑧 ∈ 𝐵))
19		opelxp 4374	. . . . . 6 ⊢ (⟨𝑤, 𝑧⟩ ∈ (𝐶 × 𝐵) ↔ (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ 𝐵))
20	19	ralbii 2330	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 ⟨𝑤, 𝑧⟩ ∈ (𝐶 × 𝐵) ↔ ∀𝑥 ∈ 𝐴 (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ 𝐵))
21	14, 18, 20	3bitr4g 212	. . . 4 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → ((𝑤 ∈ 𝐶 ∧ 𝑧 ∈ ∩ 𝑥 ∈ 𝐴 𝐵) ↔ ∀𝑥 ∈ 𝐴 ⟨𝑤, 𝑧⟩ ∈ (𝐶 × 𝐵)))
22		opelxp 4374	. . . 4 ⊢ (⟨𝑤, 𝑧⟩ ∈ (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) ↔ (𝑤 ∈ 𝐶 ∧ 𝑧 ∈ ∩ 𝑥 ∈ 𝐴 𝐵))
23		vex 2560	. . . . . 6 ⊢ 𝑤 ∈ V
24	23, 15	opex 3966	. . . . 5 ⊢ ⟨𝑤, 𝑧⟩ ∈ V
25		eliin 3662	. . . . 5 ⊢ (⟨𝑤, 𝑧⟩ ∈ V → (⟨𝑤, 𝑧⟩ ∈ ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵) ↔ ∀𝑥 ∈ 𝐴 ⟨𝑤, 𝑧⟩ ∈ (𝐶 × 𝐵)))
26	24, 25	ax-mp 7	. . . 4 ⊢ (⟨𝑤, 𝑧⟩ ∈ ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵) ↔ ∀𝑥 ∈ 𝐴 ⟨𝑤, 𝑧⟩ ∈ (𝐶 × 𝐵))
27	21, 22, 26	3bitr4g 212	. . 3 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → (⟨𝑤, 𝑧⟩ ∈ (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) ↔ ⟨𝑤, 𝑧⟩ ∈ ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵)))
28	27	eqrelrdv2 4439	. 2 ⊢ (((Rel (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) ∧ Rel ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵)) ∧ ∃𝑦 𝑦 ∈ 𝐴) → (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) = ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵))
29	11, 28	mpancom 399	1 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → (𝐶 × ∩ 𝑥 ∈ 𝐴 𝐵) = ∩ 𝑥 ∈ 𝐴 (𝐶 × 𝐵))

Syntax hints:   → wi 4   ∧ wa 97   ↔ wb 98   = wceq 1243  ∃wex 1381   ∈ wcel 1393  ∀wral 2306  ∃wrex 2307  Vcvv 2557  ⟨cop 3378  ∩ ciin 3658   × cxp 4343  Rel wrel 4350

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944

This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ral 2311  df-rex 2312  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-iin 3660  df-opab 3819  df-xp 4351  df-rel 4352

This theorem is referenced by:  xpriindim  4474