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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 3749. Partial converse of unssd 3751. (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 3749 | . . 3 ⊢ ((𝐴 ⊆ 𝐶 ∧ 𝐵 ⊆ 𝐶) ↔ (𝐴 ∪ 𝐵) ⊆ 𝐶) | |
3 | 1, 2 | sylibr 223 | . 2 ⊢ (𝜑 → (𝐴 ⊆ 𝐶 ∧ 𝐵 ⊆ 𝐶)) |
4 | 3 | simprd 478 | 1 ⊢ (𝜑 → 𝐵 ⊆ 𝐶) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 ∪ cun 3538 ⊆ wss 3540 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-v 3175 df-un 3545 df-in 3547 df-ss 3554 |
This theorem is referenced by: eldifpw 6868 ertr 7644 finsschain 8156 r0weon 8718 ackbij1lem16 8940 wunfi 9422 wunex2 9439 hashf1lem2 13097 sumsplit 14341 fsum2dlem 14343 fsumabs 14374 fsumrlim 14384 fsumo1 14385 fsumiun 14394 fprod2dlem 14549 mreexexlem3d 16129 yonedalem1 16735 yonedalem21 16736 yonedalem3a 16737 yonedalem4c 16740 yonedalem22 16741 yonedalem3b 16742 yonedainv 16744 yonffthlem 16745 ablfac1eulem 18294 lsmsp 18907 lsppratlem3 18970 mplcoe1 19286 mdetunilem9 20245 filufint 21534 fmfnfmlem4 21571 hausflim 21595 fclsfnflim 21641 fsumcn 22481 mbfeqalem 23215 itgfsum 23399 jensenlem1 24513 jensenlem2 24514 gsumvsca1 29113 gsumvsca2 29114 ordtconlem1 29298 vhmcls 30717 mclsppslem 30734 rngunsnply 36762 brtrclfv2 37038 |
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