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| Mirrors > Home > MPE Home > Th. List > wundif | Structured version Visualization version GIF version | ||
| Description: A weak universe is closed under class difference. (Contributed by Mario Carneiro, 2-Jan-2017.) | 
| Ref | Expression | 
|---|---|
| wununi.1 | ⊢ (𝜑 → 𝑈 ∈ WUni) | 
| wununi.2 | ⊢ (𝜑 → 𝐴 ∈ 𝑈) | 
| Ref | Expression | 
|---|---|
| wundif | ⊢ (𝜑 → (𝐴 ∖ 𝐵) ∈ 𝑈) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | wununi.1 | . 2 ⊢ (𝜑 → 𝑈 ∈ WUni) | |
| 2 | wununi.2 | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝑈) | |
| 3 | difssd 4137 | . 2 ⊢ (𝜑 → (𝐴 ∖ 𝐵) ⊆ 𝐴) | |
| 4 | 1, 2, 3 | wunss 10752 | 1 ⊢ (𝜑 → (𝐴 ∖ 𝐵) ∈ 𝑈) | 
| Colors of variables: wff setvar class | 
| Syntax hints: → wi 4 ∈ wcel 2108 ∖ cdif 3948 WUnicwun 10740 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-ext 2708 ax-sep 5296 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-3an 1089 df-tru 1543 df-ex 1780 df-sb 2065 df-clab 2715 df-cleq 2729 df-clel 2816 df-ne 2941 df-ral 3062 df-rex 3071 df-rab 3437 df-v 3482 df-dif 3954 df-in 3958 df-ss 3968 df-pw 4602 df-uni 4908 df-tr 5260 df-wun 10742 | 
| This theorem is referenced by: wuncn 11210 | 
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