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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 3671 uneq1 4163 r19.45zv 4467 rexprgf 4657 rextpg 4661 swopolem 5576 ordsseleq 6418 ordtri3 6425 frxp2 8198 xpord2pred 8199 xpord2indlem 8201 frxp3 8205 xpord3pred 8206 infltoreq 9533 cantnflem1 9727 axgroth2 10949 axgroth3 10955 lelttric 11456 ltxr 13284 xmulneg1 13439 fzpr 13753 elfzp12 13777 caubnd 15570 lcmval 16811 lcmass 16833 isprm6 16934 vdwlem10 17212 irredmul 20710 lringuplu 20847 domneq0 21011 prmidl 21672 prmidlprop 21683 znfld 21921 opsrval 22410 logreclem 27147 perfectlem2 27614 nnm1n0s 28818 bdaypw2n0bndlem 28906 legov3 29118 lnhl 29138 colperpex 29266 lmif 29347 islmib 29349 friendshipgt3 31056 h1datom 32241 xrlelttric 33440 tlt3 33627 domnprodeq0 33939 isedom 33953 ismxidl 34091 rprmdvds 34155 esumpcvgval 34821 sibfof 35083 satfvsuc 36334 satfv1 36336 satfvsucsuc 36338 satf0suc 36349 sat1el2xp 36352 fmlasuc0 36357 fmlafvel 36358 satfv1fvfmla1 36396 segcon2 37085 axtcond 37481 wl-ifpimpr 38657 poimirlem25 38831 cnambfre 38854 varprop 38910 negprop 38911 impprop 38912 dfprop2 38914 pridl 39237 ismaxidl 39240 ispridlc 39270 pridlc 39271 dmnnzd 39275 disjecxrncnvep 39611 4atlem3a 40920 pmapjoin 41175 lcfl3 42817 lcfl4N 42818 sticksstones22 43484 quadfac 43521 ordsssucb 44598 sbcoreleleqVD 46101 fourierdlem80 47469 euoreqb 48453 el1fzopredsuc 48669 perfectALTVlem2 49093 nnsum3primesle9 49165 clnbupgrel 49205 dfvopnbgr2 49224 idomnzd 49774 lindslinindsimp2 49906 |
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