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Mirrors > Home > ILE Home > Th. List > nsyl3 | GIF version |
Description: A negated syllogism inference. (Contributed by NM, 1-Dec-1995.) (Revised by NM, 13-Jun-2013.) |
Ref | Expression |
---|---|
nsyl3.1 | ⊢ (𝜑 → ¬ 𝜓) |
nsyl3.2 | ⊢ (𝜒 → 𝜓) |
Ref | Expression |
---|---|
nsyl3 | ⊢ (𝜒 → ¬ 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nsyl3.2 | . 2 ⊢ (𝜒 → 𝜓) | |
2 | nsyl3.1 | . . 3 ⊢ (𝜑 → ¬ 𝜓) | |
3 | 2 | a1i 9 | . 2 ⊢ (𝜒 → (𝜑 → ¬ 𝜓)) |
4 | 1, 3 | mt2d 555 | 1 ⊢ (𝜒 → ¬ 𝜑) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-in1 544 ax-in2 545 |
This theorem is referenced by: con2i 557 nsyl 558 pm2.65i 568 cesare 2004 cesaro 2008 pwnss 3912 sucprcreg 4273 reg3exmidlemwe 4303 reldmtpos 5868 fzn 8906 |
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