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Mirrors > Home > MPE Home > Th. List > snsstp1 | 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 |
---|---|
snsstp1 | ⊢ {𝐴} ⊆ {𝐴, 𝐵, 𝐶} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snsspr1 4750 | . . 3 ⊢ {𝐴} ⊆ {𝐴, 𝐵} | |
2 | ssun1 4151 | . . 3 ⊢ {𝐴, 𝐵} ⊆ ({𝐴, 𝐵} ∪ {𝐶}) | |
3 | 1, 2 | sstri 3979 | . 2 ⊢ {𝐴} ⊆ ({𝐴, 𝐵} ∪ {𝐶}) |
4 | df-tp 4575 | . 2 ⊢ {𝐴, 𝐵, 𝐶} = ({𝐴, 𝐵} ∪ {𝐶}) | |
5 | 3, 4 | sseqtrri 4007 | 1 ⊢ {𝐴} ⊆ {𝐴, 𝐵, 𝐶} |
Colors of variables: wff setvar class |
Syntax hints: ∪ cun 3937 ⊆ wss 3939 {csn 4570 {cpr 4572 {ctp 4574 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-v 3499 df-un 3944 df-in 3946 df-ss 3955 df-pr 4573 df-tp 4575 |
This theorem is referenced by: fr3nr 7497 rngbase 16623 srngbase 16631 lmodbase 16640 ipsbase 16647 ipssca 16650 phlbase 16657 topgrpbas 16665 otpsbas 16672 odrngbas 16683 odrngtset 16686 prdssca 16732 prdsbas 16733 prdstset 16742 imasbas 16788 imassca 16795 imastset 16798 fucbas 17233 setcbas 17341 catcbas 17360 estrcbas 17378 psrbas 20161 psrsca 20172 cnfldbas 20552 cnfldtset 20556 trkgbas 26234 signswch 31835 algbase 39784 clsk1indlem4 40400 clsk1indlem1 40401 rngcbasALTV 44261 ringcbasALTV 44324 |
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