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Mirrors > Home > MPE Home > Th. List > orbi2i | Structured version Visualization version GIF version |
Description: Inference adding a left disjunct to both sides of a logical equivalence. (Contributed by NM, 3-Jan-1993.) (Proof shortened by Wolf Lammen, 12-Dec-2012.) |
Ref | Expression |
---|---|
orbi2i.1 | ⊢ (𝜑 ↔ 𝜓) |
Ref | Expression |
---|---|
orbi2i | ⊢ ((𝜒 ∨ 𝜑) ↔ (𝜒 ∨ 𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orbi2i.1 | . . . 4 ⊢ (𝜑 ↔ 𝜓) | |
2 | 1 | biimpi 218 | . . 3 ⊢ (𝜑 → 𝜓) |
3 | 2 | orim2i 907 | . 2 ⊢ ((𝜒 ∨ 𝜑) → (𝜒 ∨ 𝜓)) |
4 | 1 | biimpri 230 | . . 3 ⊢ (𝜓 → 𝜑) |
5 | 4 | orim2i 907 | . 2 ⊢ ((𝜒 ∨ 𝜓) → (𝜒 ∨ 𝜑)) |
6 | 3, 5 | impbii 211 | 1 ⊢ ((𝜒 ∨ 𝜑) ↔ (𝜒 ∨ 𝜓)) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 ∨ wo 843 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 209 df-or 844 |
This theorem is referenced by: orbi1i 910 orbi12i 911 orass 918 or4 923 or42 924 orordir 926 dn1 1052 dfifp6 1063 excxor 1507 nf3 1786 nfnbi 1854 19.44v 1998 19.44 2238 r19.30OLD 3342 sspsstri 4082 unass 4145 undi 4254 undif3 4268 2nreu 4396 undif4 4419 ssunpr 4768 sspr 4769 sstp 4770 pr1eqbg 4790 iinun2 4998 iinuni 5023 qfto 5984 somin1 5996 ordtri2 6229 on0eqel 6311 frxp 7823 wfrlem14 7971 wfrlem15 7972 supgtoreq 8937 wemapsolem 9017 fin1a2lem12 9836 psslinpr 10456 suplem2pr 10478 fimaxre 11587 fimaxreOLD 11588 elnn0 11902 elxnn0 11972 elnn1uz2 12328 elxr 12514 xrinfmss 12706 elfzp1 12960 hashf1lem2 13817 dvdslelem 15662 pythagtrip 16174 tosso 17649 maducoeval2 21252 madugsum 21255 ist0-3 21956 limcdif 24477 ellimc2 24478 limcmpt 24484 limcres 24487 plydivex 24889 taylfval 24950 legtrid 26380 legso 26388 lmicom 26577 numedglnl 26932 nb3grprlem2 27166 clwwlkneq0 27810 atomli 30162 atoml2i 30163 or3di 30228 disjnf 30323 disjex 30345 disjexc 30346 cycpmrn 30789 orngsqr 30881 ind1a 31282 esumcvg 31349 voliune 31492 volfiniune 31493 bnj964 32219 satfvsucsuc 32616 satfrnmapom 32621 satf0op 32628 fmlaomn0 32641 dfso2 32994 soseq 33100 frrlem12 33138 lineunray 33612 bj-dfbi4 33910 poimirlem18 34914 poimirlem23 34919 poimirlem27 34923 poimirlem31 34927 itg2addnclem2 34948 tsxo1 35419 tsxo2 35420 tsxo3 35421 tsxo4 35422 tsna1 35426 tsna2 35427 tsna3 35428 ts3an1 35432 ts3an2 35433 ts3an3 35434 ts3or1 35435 ts3or2 35436 ts3or3 35437 dfeldisj5 35958 ifpim123g 39872 ifpor123g 39880 rp-fakeoranass 39886 ontric3g 39894 frege133d 40116 or3or 40377 undif3VD 41222 wallispilem3 42359 iccpartgt 43594 nnsum4primeseven 43972 nnsum4primesevenALTV 43973 lindslinindsimp2 44525 |
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