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Theorem wunint 10793
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 10784 . . 3 (𝜑 → ∪ 𝐴 ∈ 𝑈)
54adantr 486 . 2 ((𝜑 ∧ 𝐴 ≠ ∅) → ∪ 𝐴 ∈ 𝑈)
6 intssuni 4930 . . 3 (𝐴 ≠ ∅ → ∩ 𝐴 ⊆ ∪ 𝐴)
76adantl 487 . 2 ((𝜑 ∧ 𝐴 ≠ ∅) → ∩ 𝐴 ⊆ ∪ 𝐴)
82, 5, 7wunss 10790 1 ((𝜑 ∧ 𝐴 ≠ ∅) → ∩ 𝐴 ∈ 𝑈)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∈ wcel 2145   ≠ wne 2956   ⊆ wss 3899  ∅c0 4279  ∪ cuni 4867  ∩ cint 4907  WUnicwun 10778
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-sep 5249
This proof depends on definitions:  df-bi 210  df-an 402  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-ne 2957  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-in 3906  df-ss 3916  df-nul 4280  df-pw 4559  df-uni 4868  df-int 4908  df-tr 5213  df-wun 10780
This theorem is used by: (None)
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