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Mirrors > Home > MPE Home > Th. List > pm2.61ii | Structured version Visualization version GIF version |
Description: Inference eliminating two antecedents. (Contributed by NM, 4-Jan-1993.) (Proof shortened by Josh Purinton, 29-Dec-2000.) |
Ref | Expression |
---|---|
pm2.61ii.1 | ⊢ (¬ 𝜑 → (¬ 𝜓 → 𝜒)) |
pm2.61ii.2 | ⊢ (𝜑 → 𝜒) |
pm2.61ii.3 | ⊢ (𝜓 → 𝜒) |
Ref | Expression |
---|---|
pm2.61ii | ⊢ 𝜒 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm2.61ii.2 | . 2 ⊢ (𝜑 → 𝜒) | |
2 | pm2.61ii.1 | . . 3 ⊢ (¬ 𝜑 → (¬ 𝜓 → 𝜒)) | |
3 | pm2.61ii.3 | . . 3 ⊢ (𝜓 → 𝜒) | |
4 | 2, 3 | pm2.61d2 182 | . 2 ⊢ (¬ 𝜑 → 𝜒) |
5 | 1, 4 | pm2.61i 183 | 1 ⊢ 𝜒 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem is referenced by: pm2.61iii 186 hbae 2448 pssnn 8725 alephadd 9988 axextnd 10002 axunnd 10007 axpownd 10012 axregndlem2 10014 axregnd 10015 axinfndlem1 10016 axinfnd 10017 2cshwcshw 14177 ressress 16552 frgrreg 28101 bj-hbaeb2 34039 hbae-o 35921 hbequid 35927 ax5eq 35950 ax5el 35955 odd2prm2 43730 |
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