Theorem elpwiuncl 32507

Description: Closure of indexed union with regard to elementhood to a power set. (Contributed by Thierry Arnoux, 27-May-2020.)

Hypotheses

Ref	Expression
elpwiuncl.1	⊢ (𝜑 → 𝐴 ∈ 𝑉)
elpwiuncl.2	⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ 𝒫 𝐶)

Assertion

Ref	Expression
elpwiuncl	⊢ (𝜑 → ∪ 𝑘 ∈ 𝐴 𝐵 ∈ 𝒫 𝐶)

Distinct variable groups:   𝐴,𝑘   𝐶,𝑘   𝜑,𝑘

Allowed substitution hints:   𝐵(𝑘)   𝑉(𝑘)

Proof of Theorem elpwiuncl

Step	Hyp	Ref	Expression
1		elpwiuncl.2	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ 𝒫 𝐶)
2	1	elpwid 4556	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ⊆ 𝐶)
3	2	ralrimiva 3124	. . 3 ⊢ (𝜑 → ∀𝑘 ∈ 𝐴 𝐵 ⊆ 𝐶)
4		iunss 4992	. . 3 ⊢ (∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝐶 ↔ ∀𝑘 ∈ 𝐴 𝐵 ⊆ 𝐶)
5	3, 4	sylibr 234	. 2 ⊢ (𝜑 → ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝐶)
6		elpwiuncl.1	. . . 4 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
7	1	ralrimiva 3124	. . . 4 ⊢ (𝜑 → ∀𝑘 ∈ 𝐴 𝐵 ∈ 𝒫 𝐶)
8	6, 7	jca 511	. . 3 ⊢ (𝜑 → (𝐴 ∈ 𝑉 ∧ ∀𝑘 ∈ 𝐴 𝐵 ∈ 𝒫 𝐶))
9		iunexg 7895	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑘 ∈ 𝐴 𝐵 ∈ 𝒫 𝐶) → ∪ 𝑘 ∈ 𝐴 𝐵 ∈ V)
10		elpwg 4550	. . 3 ⊢ (∪ 𝑘 ∈ 𝐴 𝐵 ∈ V → (∪ 𝑘 ∈ 𝐴 𝐵 ∈ 𝒫 𝐶 ↔ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝐶))
11	8, 9, 10	3syl 18	. 2 ⊢ (𝜑 → (∪ 𝑘 ∈ 𝐴 𝐵 ∈ 𝒫 𝐶 ↔ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝐶))
12	5, 11	mpbird 257	1 ⊢ (𝜑 → ∪ 𝑘 ∈ 𝐴 𝐵 ∈ 𝒫 𝐶)

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   ∈ wcel 2111  ∀wral 3047  Vcvv 3436   ⊆ wss 3897  𝒫 cpw 4547  ∪ ciun 4939

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-10 2144  ax-11 2160  ax-12 2180  ax-ext 2703  ax-rep 5215  ax-sep 5232  ax-un 7668

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-tru 1544  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2535  df-clab 2710  df-cleq 2723  df-clel 2806  df-nfc 2881  df-ral 3048  df-rex 3057  df-v 3438  df-ss 3914  df-pw 4549  df-uni 4857  df-iun 4941

This theorem is referenced by:  carsggect  34331  carsgclctunlem2  34332