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Theorem wunint 10805
Description: A weak universe is closed under nonempty intersections. (Contributed by Mario Carneiro, 2-Jan-2017.)
Hypotheses
Ref Expression
wununi.1 (𝜑 → 𝑈 ∈ WUni)
wununi.2 (𝜑 → 𝐴 ∈ 𝑈)
Assertion
Ref Expression
wunint ((𝜑 ∧ 𝐴 ≠ ∅) → ∩ 𝐴 ∈ 𝑈)

Proof of Theorem wunint
StepHypRef Expression
1 wununi.1 . . 3 (𝜑 → 𝑈 ∈ WUni)
21adantr 486 . 2 ((𝜑 ∧ 𝐴 ≠ ∅) → 𝑈 ∈ WUni)
3 wununi.2 . . . 4 (𝜑 → 𝐴 ∈ 𝑈)
41, 3wununi 10796 . . 3 (𝜑 → ∪ 𝐴 ∈ 𝑈)
54adantr 486 . 2 ((𝜑 ∧ 𝐴 ≠ ∅) → ∪ 𝐴 ∈ 𝑈)
6 intssuni 4929 . . 3 (𝐴 ≠ ∅ → ∩ 𝐴 ⊆ ∪ 𝐴)
76adantl 487 . 2 ((𝜑 ∧ 𝐴 ≠ ∅) → ∩ 𝐴 ⊆ ∪ 𝐴)
82, 5, 7wunss 10802 1 ((𝜑 ∧ 𝐴 ≠ ∅) → ∩ 𝐴 ∈ 𝑈)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∈ wcel 2144   ≠ wne 2955   ⊆ wss 3896  ∅c0 4277  ∪ cuni 4866  ∩ cint 4906  WUnicwun 10790
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-sep 5248
This proof depends on definitions:  df-bi 210  df-an 402  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-ne 2956  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3897  df-dif 4046  df-in 4090  df-nul 4278  df-pw 4558  df-uni 4867  df-int 4907  df-tr 5212  df-wun 10792
This theorem is used by: (None)
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