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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 3667 uneq1 4160 r19.45zv 4463 rexprgf 4652 rextpg 4656 swopolem 5568 ordsseleq 6392 ordtri3 6399 frxp2 8164 xpord2pred 8165 xpord2indlem 8167 frxp3 8171 xpord3pred 8172 infltoreq 9500 cantnflem1 9694 axgroth2 10914 axgroth3 10920 lelttric 11421 ltxr 13248 xmulneg1 13403 fzpr 13717 elfzp12 13741 caubnd 15532 lcmval 16773 lcmass 16795 isprm6 16896 vdwlem10 17174 irredmul 20665 lringuplu 20802 domneq0 20966 prmidl 21627 prmidlprop 21638 znfld 21872 opsrval 22361 logreclem 27096 perfectlem2 27563 nnm1n0s 28767 bdaypw2n0bndlem 28855 legov3 29067 lnhl 29087 colperpex 29215 lmif 29296 islmib 29298 friendshipgt3 31005 h1datom 32190 xrlelttric 33391 tlt3 33578 domnprodeq0 33887 ismxidl 34034 rprmdvds 34098 esumpcvgval 34757 sibfof 35019 satfvsuc 36213 satfv1 36215 satfvsucsuc 36217 satf0suc 36228 sat1el2xp 36231 fmlasuc0 36236 fmlafvel 36237 satfv1fvfmla1 36275 segcon2 36963 axtcond 37359 wl-ifpimpr 38483 poimirlem25 38657 cnambfre 38680 varprop 38736 negprop 38737 impprop 38738 dfprop2 38740 pridl 39065 ismaxidl 39068 ispridlc 39098 pridlc 39099 dmnnzd 39103 disjecxrncnvep 39439 4atlem3a 40748 pmapjoin 41003 lcfl3 42645 lcfl4N 42646 sticksstones22 43312 quadfac 43349 ordsssucb 44431 sbcoreleleqVD 45935 fourierdlem80 47290 euoreqb 48273 el1fzopredsuc 48490 perfectALTVlem2 48914 nnsum3primesle9 48986 clnbupgrel 49026 dfvopnbgr2 49045 idomnzd 49537 lindslinindsimp2 49669 |
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