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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 4109 | . 2 ⊢ (𝜑 → (𝐴 ∖ 𝐵) ⊆ 𝐴) | |
4 | 1, 2, 3 | wunss 10128 | 1 ⊢ (𝜑 → (𝐴 ∖ 𝐵) ∈ 𝑈) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2110 ∖ cdif 3933 WUnicwun 10116 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2156 ax-12 2172 ax-ext 2793 ax-sep 5196 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3497 df-dif 3939 df-in 3943 df-ss 3952 df-pw 4541 df-uni 4833 df-tr 5166 df-wun 10118 |
This theorem is referenced by: wuncn 10586 |
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