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Mirrors > Home > MPE Home > Th. List > prid2 | Structured version Visualization version GIF version |
Description: An unordered pair contains its second member. Part of Theorem 7.6 of [Quine] p. 49. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
prid2.1 | ⊢ 𝐵 ∈ V |
Ref | Expression |
---|---|
prid2 | ⊢ 𝐵 ∈ {𝐴, 𝐵} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | prid2.1 | . . 3 ⊢ 𝐵 ∈ V | |
2 | 1 | prid1 4241 | . 2 ⊢ 𝐵 ∈ {𝐵, 𝐴} |
3 | prcom 4211 | . 2 ⊢ {𝐵, 𝐴} = {𝐴, 𝐵} | |
4 | 2, 3 | eleqtri 2686 | 1 ⊢ 𝐵 ∈ {𝐴, 𝐵} |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 1977 Vcvv 3173 {cpr 4127 |
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-sn 4126 df-pr 4128 |
This theorem is referenced by: prel12 4323 opi2 4865 opeluu 4866 opthwiener 4901 dmrnssfld 5305 funopg 5836 2dom 7915 dfac2 8836 brdom7disj 9234 brdom6disj 9235 cnelprrecn 9908 mnfxr 9975 m1expcl2 12744 hash2prb 13111 pr2pwpr 13116 sadcf 15013 xpsfrnel2 16048 setcepi 16561 grpss 17263 efgi1 17957 frgpuptinv 18007 dmdprdpr 18271 dprdpr 18272 cnmsgnsubg 19742 m2detleiblem6 20251 m2detleiblem3 20254 m2detleiblem4 20255 m2detleib 20256 indiscld 20705 xpstopnlem1 21422 xpstopnlem2 21424 i1f1lem 23262 i1f1 23263 aannenlem2 23888 taylthlem2 23932 ppiublem2 24728 lgsdir2lem3 24852 ecgrtg 25663 elntg 25664 wlkntrl 26092 usgra2wlkspthlem2 26148 constr3lem4 26175 usg2wlkonot 26410 usg2wotspth 26411 eupath 26508 ex-br 26680 ex-eprel 26682 subfacp1lem3 30418 kur14lem7 30448 fprb 30916 sltres 31061 noxp2o 31064 nobndup 31099 onpsstopbas 31599 onint1 31618 bj-inftyexpidisj 32274 kelac2 36653 fvrcllb1d 37006 relexp1idm 37025 corcltrcl 37050 cotrclrcl 37053 clsk1indlem1 37363 refsum2cnlem1 38219 fourierdlem103 39102 fourierdlem104 39103 ioorrnopn 39201 ioorrnopnxr 39203 usgr2trlncl 40966 umgrwwlks2on 41161 1wlk2v2e 41324 eulerpathpr 41408 zlmodzxzscm 41928 zlmodzxzldeplem3 42085 nn0sumshdiglemB 42212 |
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