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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 219 | . . 3 ⊢ (𝜑 → 𝜓) |
3 | 2 | orim2i 911 | . 2 ⊢ ((𝜒 ∨ 𝜑) → (𝜒 ∨ 𝜓)) |
4 | 1 | biimpri 231 | . . 3 ⊢ (𝜓 → 𝜑) |
5 | 4 | orim2i 911 | . 2 ⊢ ((𝜒 ∨ 𝜓) → (𝜒 ∨ 𝜑)) |
6 | 3, 5 | impbii 212 | 1 ⊢ ((𝜒 ∨ 𝜑) ↔ (𝜒 ∨ 𝜓)) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 ∨ wo 847 |
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 210 df-or 848 |
This theorem is referenced by: orbi1i 914 orbi12i 915 orass 922 or4 927 or42 928 orordir 930 dn1 1058 dfifp6 1069 excxor 1513 nf3 1794 nfnbiOLD 1863 19.44v 2002 19.44 2237 sspsstri 4003 unass 4066 undi 4175 undif3 4191 2nreu 4342 undif4 4367 ssunpr 4731 sspr 4732 sstp 4733 pr1eqbg 4753 iinun2 4967 iinuni 4992 qfto 5966 somin1 5978 ordtri2 6226 on0eqel 6309 frxp 7871 frrlem12 8016 wfrlem14 8046 wfrlem15 8047 supgtoreq 9064 wemapsolem 9144 fin1a2lem12 9990 psslinpr 10610 suplem2pr 10632 fimaxre 11741 elnn0 12057 elxnn0 12129 elnn1uz2 12486 elxr 12673 xrinfmss 12865 elfzp1 13127 hashf1lem2 13987 dvdslelem 15833 pythagtrip 16350 tosso 17879 maducoeval2 21491 madugsum 21494 ist0-3 22196 limcdif 24727 ellimc2 24728 limcmpt 24734 limcres 24737 plydivex 25144 taylfval 25205 legtrid 26636 legso 26644 lmicom 26833 numedglnl 27189 nb3grprlem2 27423 clwwlkneq0 28066 atomli 30417 atoml2i 30418 or3di 30483 disjnf 30582 disjex 30604 disjexc 30605 cycpmrn 31083 orngsqr 31176 ind1a 31653 esumcvg 31720 voliune 31863 volfiniune 31864 bnj964 32590 satfvsucsuc 32994 satfrnmapom 32999 satf0op 33006 fmlaomn0 33019 dfso2 33391 poxp2 33470 poxp3 33476 soseq 33483 lineunray 34135 bj-dfbi4 34440 wl-ifpimpr 35323 wl-df4-3mintru2 35344 poimirlem18 35481 poimirlem23 35486 poimirlem27 35490 poimirlem31 35494 itg2addnclem2 35515 tsxo1 35981 tsxo2 35982 tsxo3 35983 tsxo4 35984 tsna1 35988 tsna2 35989 tsna3 35990 ts3an1 35994 ts3an2 35995 ts3an3 35996 ts3or1 35997 ts3or2 35998 ts3or3 35999 dfeldisj5 36518 ifpim123g 40733 ifpor123g 40741 rp-fakeoranass 40747 ontric3g 40755 frege133d 40991 or3or 41249 undif3VD 42116 wallispilem3 43226 iccpartgt 44495 nnsum4primeseven 44868 nnsum4primesevenALTV 44869 lindslinindsimp2 45420 |
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