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| Mirrors > Home > MPE Home > Th. List > orbi1d | Structured version Visualization version GIF version | ||
| Description: Deduction adding a right disjunct to both sides of a logical equivalence. (Contributed by NM, 21-Jun-1993.) |
| Ref | Expression |
|---|---|
| bid.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
| Ref | Expression |
|---|---|
| orbi1d | ⊢ (𝜑 → ((𝜓 ∨ 𝜃) ↔ (𝜒 ∨ 𝜃))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bid.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
| 2 | 1 | orbi2d 929 | . 2 ⊢ (𝜑 → ((𝜃 ∨ 𝜓) ↔ (𝜃 ∨ 𝜒))) |
| 3 | orcom 884 | . 2 ⊢ ((𝜓 ∨ 𝜃) ↔ (𝜃 ∨ 𝜓)) | |
| 4 | orcom 884 | . 2 ⊢ ((𝜒 ∨ 𝜃) ↔ (𝜃 ∨ 𝜒)) | |
| 5 | 2, 3, 4 | 3bitr4g 317 | 1 ⊢ (𝜑 → ((𝜓 ∨ 𝜃) ↔ (𝜒 ∨ 𝜃))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∨ wo 861 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
| This proof depends on definitions: df-bi 210 df-or 862 |
| This theorem is used by: orbi1 931 orbi12d 932 eueq2 3675 uneq1 4115 r19.45zv 4471 rexprgf 4663 rextpg 4667 swopolem 5581 ordsseleq 6394 ordtri3 6401 frxp2 8142 xpord2pred 8143 xpord2indlem 8145 frxp3 8149 xpord3pred 8150 infltoreq 9467 cantnflem1 9661 axgroth2 10821 axgroth3 10827 lelttric 11328 ltxr 13152 xmulneg1 13307 fzpr 13620 elfzp12 13644 caubnd 15430 lcmval 16668 lcmass 16690 isprm6 16791 vdwlem10 17068 irredmul 20537 lringuplu 20673 domneq0 20837 prmidl 21495 prmidlprop 21506 znfld 21740 opsrval 22227 logreclem 26958 perfectlem2 27425 nnm1n0s 28599 bdaypw2n0bndlem 28687 legov3 28898 lnhl 28918 colperpex 29045 lmif 29125 islmib 29127 friendshipgt3 30796 h1datom 31981 xrlelttric 33143 tlt3 33330 domnprodeq0 33639 ismxidl 33785 rprmdvds 33849 esumpcvgval 34508 sibfof 34771 satfvsuc 35866 satfv1 35868 satfvsucsuc 35870 satf0suc 35881 sat1el2xp 35884 fmlasuc0 35889 fmlafvel 35890 satfv1fvfmla1 35928 segcon2 36610 axtcond 37022 wl-ifpimpr 38145 poimirlem25 38329 cnambfre 38352 pridl 38721 ismaxidl 38724 ispridlc 38754 pridlc 38755 dmnnzd 38759 disjecxrncnvep 39095 4atlem3a 40404 pmapjoin 40659 lcfl3 42301 lcfl4N 42302 sticksstones22 42968 quadfac 43005 ordsssucb 44095 sbcoreleleqVD 45600 fourierdlem80 46933 euoreqb 47879 el1fzopredsuc 48096 perfectALTVlem2 48520 nnsum3primesle9 48592 clnbupgrel 48632 dfvopnbgr2 48651 idomnzd 49144 lindslinindsimp2 49276 |
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