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Mirrors > Home > MPE Home > Th. List > snsstp3 | Structured version Visualization version GIF version |
Description: A singleton is a subset of an unordered triple containing its member. (Contributed by NM, 9-Oct-2013.) |
Ref | Expression |
---|---|
snsstp3 | ⊢ {𝐶} ⊆ {𝐴, 𝐵, 𝐶} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssun2 4149 | . 2 ⊢ {𝐶} ⊆ ({𝐴, 𝐵} ∪ {𝐶}) | |
2 | df-tp 4572 | . 2 ⊢ {𝐴, 𝐵, 𝐶} = ({𝐴, 𝐵} ∪ {𝐶}) | |
3 | 1, 2 | sseqtrri 4004 | 1 ⊢ {𝐶} ⊆ {𝐴, 𝐵, 𝐶} |
Colors of variables: wff setvar class |
Syntax hints: ∪ cun 3934 ⊆ wss 3936 {csn 4567 {cpr 4569 {ctp 4571 |
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 df-tp 4572 |
This theorem is referenced by: fr3nr 7494 rngmulr 16622 srngmulr 16630 lmodsca 16639 ipsmulr 16646 ipsip 16649 phlsca 16656 topgrptset 16664 otpsle 16671 odrngmulr 16682 odrngds 16685 prdsmulr 16732 prdsip 16734 prdsds 16737 imasds 16786 imasmulr 16791 imasip 16794 fuccofval 17229 setccofval 17342 catccofval 17360 estrccofval 17379 xpccofval 17432 psrmulr 20164 cnfldmul 20551 cnfldds 20555 trkgitv 26233 signswch 31831 algmulr 39800 clsk1indlem1 40415 rngccofvalALTV 44278 ringccofvalALTV 44341 |
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