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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 10131 | . . 3 ⊢ (𝜑 → 𝒫 𝐴 ∈ 𝑈) |
4 | 1, 3 | wunelss 10132 | . 2 ⊢ (𝜑 → 𝒫 𝐴 ⊆ 𝑈) |
5 | wunss.3 | . . 3 ⊢ (𝜑 → 𝐵 ⊆ 𝐴) | |
6 | 2, 5 | sselpwd 5232 | . 2 ⊢ (𝜑 → 𝐵 ∈ 𝒫 𝐴) |
7 | 4, 6 | sseldd 3970 | 1 ⊢ (𝜑 → 𝐵 ∈ 𝑈) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2114 ⊆ wss 3938 𝒫 cpw 4541 WUnicwun 10124 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-ral 3145 df-rab 3149 df-v 3498 df-in 3945 df-ss 3954 df-pw 4543 df-uni 4841 df-tr 5175 df-wun 10126 |
This theorem is referenced by: wunin 10137 wundif 10138 wunint 10139 wun0 10142 wunom 10144 wunxp 10148 wunpm 10149 wunmap 10150 wundm 10152 wunrn 10153 wuncnv 10154 wunres 10155 wunfv 10156 wunco 10157 wuntpos 10158 wuncn 10594 wunndx 16506 wunstr 16509 wunfunc 17171 |
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