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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 3668 uneq1 4108 r19.45zv 4464 rexprgf 4656 rextpg 4660 swopolem 5573 ordsseleq 6387 ordtri3 6394 frxp2 8142 xpord2pred 8143 xpord2indlem 8145 frxp3 8149 xpord3pred 8150 infltoreq 9474 cantnflem1 9668 axgroth2 10834 axgroth3 10840 lelttric 11341 ltxr 13166 xmulneg1 13321 fzpr 13634 elfzp12 13658 caubnd 15446 lcmval 16682 lcmass 16704 isprm6 16805 vdwlem10 17082 irredmul 20570 lringuplu 20706 domneq0 20870 prmidl 21528 prmidlprop 21539 znfld 21773 opsrval 22262 logreclem 26999 perfectlem2 27466 nnm1n0s 28640 bdaypw2n0bndlem 28728 legov3 28940 lnhl 28960 colperpex 29088 lmif 29169 islmib 29171 friendshipgt3 30878 h1datom 32063 xrlelttric 33223 tlt3 33410 domnprodeq0 33719 ismxidl 33865 rprmdvds 33929 esumpcvgval 34588 sibfof 34851 satfvsuc 35940 satfv1 35942 satfvsucsuc 35944 satf0suc 35955 sat1el2xp 35958 fmlasuc0 35963 fmlafvel 35964 satfv1fvfmla1 36002 segcon2 36685 axtcond 37097 wl-ifpimpr 38220 poimirlem25 38394 cnambfre 38417 pridl 38787 ismaxidl 38790 ispridlc 38820 pridlc 38821 dmnnzd 38825 disjecxrncnvep 39161 4atlem3a 40470 pmapjoin 40725 lcfl3 42367 lcfl4N 42368 sticksstones22 43034 quadfac 43071 ordsssucb 44176 sbcoreleleqVD 45681 fourierdlem80 47014 euoreqb 47997 el1fzopredsuc 48214 perfectALTVlem2 48638 nnsum3primesle9 48710 clnbupgrel 48750 dfvopnbgr2 48769 idomnzd 49261 lindslinindsimp2 49393 |
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