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Mirrors > Home > MPE Home > Th. List > wunss | Structured version Visualization version GIF version |
Description: A weak universe is closed under subsets. (Contributed by Mario Carneiro, 2-Jan-2017.) |
Ref | Expression |
---|---|
wununi.1 | ⊢ (𝜑 → 𝑈 ∈ WUni) |
wununi.2 | ⊢ (𝜑 → 𝐴 ∈ 𝑈) |
wunss.3 | ⊢ (𝜑 → 𝐵 ⊆ 𝐴) |
Ref | Expression |
---|---|
wunss | ⊢ (𝜑 → 𝐵 ∈ 𝑈) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wununi.1 | . . 3 ⊢ (𝜑 → 𝑈 ∈ WUni) | |
2 | wununi.2 | . . . 4 ⊢ (𝜑 → 𝐴 ∈ 𝑈) | |
3 | 1, 2 | wunpw 10118 | . . 3 ⊢ (𝜑 → 𝒫 𝐴 ∈ 𝑈) |
4 | 1, 3 | wunelss 10119 | . 2 ⊢ (𝜑 → 𝒫 𝐴 ⊆ 𝑈) |
5 | wunss.3 | . . 3 ⊢ (𝜑 → 𝐵 ⊆ 𝐴) | |
6 | 2, 5 | sselpwd 5194 | . 2 ⊢ (𝜑 → 𝐵 ∈ 𝒫 𝐴) |
7 | 4, 6 | sseldd 3916 | 1 ⊢ (𝜑 → 𝐵 ∈ 𝑈) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2111 ⊆ wss 3881 𝒫 cpw 4497 WUnicwun 10111 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-11 2158 ax-ext 2770 ax-sep 5167 |
This theorem depends on definitions: df-bi 210 df-an 400 df-3an 1086 df-tru 1541 df-ex 1782 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-ne 2988 df-ral 3111 df-rab 3115 df-v 3443 df-in 3888 df-ss 3898 df-pw 4499 df-uni 4801 df-tr 5137 df-wun 10113 |
This theorem is referenced by: wunin 10124 wundif 10125 wunint 10126 wun0 10129 wunom 10131 wunxp 10135 wunpm 10136 wunmap 10137 wundm 10139 wunrn 10140 wuncnv 10141 wunres 10142 wunfv 10143 wunco 10144 wuntpos 10145 wuncn 10581 wunndx 16496 wunstr 16499 wunfunc 17161 |
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