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Mirrors > Home > MPE Home > Th. List > orel2 | Structured version Visualization version GIF version |
Description: Elimination of disjunction by denial of a disjunct. Theorem *2.56 of [WhiteheadRussell] p. 107. (Contributed by NM, 12-Aug-1994.) (Proof shortened by Wolf Lammen, 5-Apr-2013.) |
Ref | Expression |
---|---|
orel2 | ⊢ (¬ 𝜑 → ((𝜓 ∨ 𝜑) → 𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | idd 24 | . 2 ⊢ (¬ 𝜑 → (𝜓 → 𝜓)) | |
2 | pm2.21 119 | . 2 ⊢ (¬ 𝜑 → (𝜑 → 𝜓)) | |
3 | 1, 2 | jaod 394 | 1 ⊢ (¬ 𝜑 → ((𝜓 ∨ 𝜑) → 𝜓)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∨ wo 382 |
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 196 df-or 384 |
This theorem is referenced by: biorfi 421 biorfiOLD 422 pm2.64 826 pm2.74 887 pm5.71 973 prel12 4323 xpcan2 5490 funun 5846 ablfac1eulem 18294 drngmuleq0 18593 mdetunilem9 20245 maducoeval2 20265 tdeglem4 23624 deg1sublt 23674 dgrnznn 23807 dvply1 23843 aaliou2 23899 colline 25344 axcontlem2 25645 3orel3 30848 dfrdg4 31228 arg-ax 31585 unbdqndv2lem2 31671 elpell14qr2 36444 elpell1qr2 36454 jm2.22 36580 jm2.23 36581 jm2.26lem3 36586 ttac 36621 wepwsolem 36630 3ornot23VD 38104 fmul01lt1lem2 38652 cncfiooicclem1 38779 |
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