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Mirrors > Home > MPE Home > Th. List > elpr | Structured version Visualization version GIF version |
Description: A member of an unordered pair of classes is one or the other of them. Exercise 1 of [TakeutiZaring] p. 15. (Contributed by NM, 13-Sep-1995.) |
Ref | Expression |
---|---|
elpr.1 | ⊢ 𝐴 ∈ V |
Ref | Expression |
---|---|
elpr | ⊢ (𝐴 ∈ {𝐵, 𝐶} ↔ (𝐴 = 𝐵 ∨ 𝐴 = 𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elpr.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | elprg 4144 | . 2 ⊢ (𝐴 ∈ V → (𝐴 ∈ {𝐵, 𝐶} ↔ (𝐴 = 𝐵 ∨ 𝐴 = 𝐶))) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐴 ∈ {𝐵, 𝐶} ↔ (𝐴 = 𝐵 ∨ 𝐴 = 𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 195 ∨ wo 382 = wceq 1475 ∈ 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: difprsnss 4270 preqr1OLD 4320 preq12b 4322 prel12 4323 pwpr 4368 pwtp 4369 unipr 4385 intpr 4445 axpr 4832 zfpair2 4834 elopOLD 4863 opthwiener 4901 tpres 6371 fnprb 6377 2oconcl 7470 pw2f1olem 7949 sdom2en01 9007 gruun 9507 fzpr 12266 m1expeven 12769 bpoly2 14627 bpoly3 14628 lcmfpr 15178 isprm2 15233 drngnidl 19050 psgninv 19747 psgnodpm 19753 mdetunilem7 20243 indistopon 20615 dfcon2 21032 cnconn 21035 uncon 21042 txindis 21247 txcon 21302 filcon 21497 xpsdsval 21996 rolle 23557 dvivthlem1 23575 ang180lem3 24341 ang180lem4 24342 wilthlem2 24595 sqff1o 24708 ppiub 24729 lgslem1 24822 lgsdir2lem4 24853 lgsdir2lem5 24854 gausslemma2dlem0i 24889 2lgslem3 24929 2lgslem4 24931 structiedg0val 25699 usgraexmplef 25929 3vfriswmgralem 26531 lmat22lem 29211 signslema 29965 subfacp1lem1 30415 subfacp1lem4 30419 nosgnn0 31055 rankeq1o 31448 onsucconi 31606 topdifinfindis 32370 poimirlem9 32588 divrngidl 32997 isfldidl 33037 dihmeetlem2N 35606 wopprc 36615 pw2f1ocnv 36622 kelac2lem 36652 rnmptpr 38353 cncfiooicclem1 38779 31prm 40050 lighneallem4 40065 3vfriswmgrlem 41447 gsumpr 41932 nn0sumshdiglem2 42214 onsetreclem3 42249 |
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