Theorem wunxp 9425

Description: A weak universe is closed under cartesian products. (Contributed by Mario Carneiro, 2-Jan-2017.)

Hypotheses

Ref	Expression
wun0.1	⊢ (𝜑 → 𝑈 ∈ WUni)
wunop.2	⊢ (𝜑 → 𝐴 ∈ 𝑈)
wunop.3	⊢ (𝜑 → 𝐵 ∈ 𝑈)

Assertion

Ref	Expression
wunxp	⊢ (𝜑 → (𝐴 × 𝐵) ∈ 𝑈)

Proof of Theorem wunxp

Step	Hyp	Ref	Expression
1		wun0.1	. 2 ⊢ (𝜑 → 𝑈 ∈ WUni)
2		wunop.2	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ 𝑈)
3		wunop.3	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ 𝑈)
4	1, 2, 3	wunun 9411	. . . 4 ⊢ (𝜑 → (𝐴 ∪ 𝐵) ∈ 𝑈)
5	1, 4	wunpw 9408	. . 3 ⊢ (𝜑 → 𝒫 (𝐴 ∪ 𝐵) ∈ 𝑈)
6	1, 5	wunpw 9408	. 2 ⊢ (𝜑 → 𝒫 𝒫 (𝐴 ∪ 𝐵) ∈ 𝑈)
7		xpsspw 5156	. . 3 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵)
8	7	a1i 11	. 2 ⊢ (𝜑 → (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵))
9	1, 6, 8	wunss 9413	1 ⊢ (𝜑 → (𝐴 × 𝐵) ∈ 𝑈)

Syntax hints:   → wi 4   ∈ wcel 1977   ∪ cun 3538   ⊆ wss 3540  𝒫 cpw 4108   × cxp 5036  WUnicwun 9401

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pr 4833

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-opab 4644  df-tr 4681  df-xp 5044  df-rel 5045  df-wun 9403

This theorem is referenced by:  wunpm  9426  wuncnv  9431  wunco  9434  wuntpos  9435  tskxp  9488  wuncn  9870  wunfunc  16382  wunnat  16439  catcoppccl  16581  catcfuccl  16582  catcxpccl  16670