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Mirrors > Home > MPE Home > Th. List > unssbd | Structured version Visualization version GIF version |
Description: If (𝐴 ∪ 𝐵) is contained in 𝐶, so is 𝐵. One-way deduction form of unss 4160. Partial converse of unssd 4162. (Contributed by David Moews, 1-May-2017.) |
Ref | Expression |
---|---|
unssad.1 | ⊢ (𝜑 → (𝐴 ∪ 𝐵) ⊆ 𝐶) |
Ref | Expression |
---|---|
unssbd | ⊢ (𝜑 → 𝐵 ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | unssad.1 | . . 3 ⊢ (𝜑 → (𝐴 ∪ 𝐵) ⊆ 𝐶) | |
2 | unss 4160 | . . 3 ⊢ ((𝐴 ⊆ 𝐶 ∧ 𝐵 ⊆ 𝐶) ↔ (𝐴 ∪ 𝐵) ⊆ 𝐶) | |
3 | 1, 2 | sylibr 236 | . 2 ⊢ (𝜑 → (𝐴 ⊆ 𝐶 ∧ 𝐵 ⊆ 𝐶)) |
4 | 3 | simprd 498 | 1 ⊢ (𝜑 → 𝐵 ⊆ 𝐶) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 ∪ cun 3934 ⊆ wss 3936 |
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 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-v 3496 df-un 3941 df-in 3943 df-ss 3952 |
This theorem is referenced by: eldifpw 7490 ertr 8304 finsschain 8831 r0weon 9438 ackbij1lem16 9657 wunfi 10143 wunex2 10160 hashf1lem2 13815 sumsplit 15123 fsum2dlem 15125 fsumabs 15156 fsumrlim 15166 fsumo1 15167 fsumiun 15176 fprod2dlem 15334 mreexexlem3d 16917 yonedalem1 17522 yonedalem21 17523 yonedalem3a 17524 yonedalem4c 17527 yonedalem22 17528 yonedalem3b 17529 yonedainv 17531 yonffthlem 17532 ablfac1eulem 19194 lsmsp 19858 lsppratlem3 19921 mplcoe1 20246 mdetunilem9 21229 filufint 22528 fmfnfmlem4 22565 hausflim 22589 fclsfnflim 22635 fsumcn 23478 itgfsum 24427 jensenlem1 25564 jensenlem2 25565 gsumvsca1 30854 gsumvsca2 30855 ordtconnlem1 31167 vhmcls 32813 mclsppslem 32830 rngunsnply 39793 brtrclfv2 40092 |
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