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Mirrors > Home > ILE Home > Th. List > nfnd | GIF version |
Description: Deduction associated with nfnt 1634. (Contributed by Mario Carneiro, 24-Sep-2016.) |
Ref | Expression |
---|---|
nfnd.1 | ⊢ (𝜑 → Ⅎ𝑥𝜓) |
Ref | Expression |
---|---|
nfnd | ⊢ (𝜑 → Ⅎ𝑥 ¬ 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfnd.1 | . 2 ⊢ (𝜑 → Ⅎ𝑥𝜓) | |
2 | nfnt 1634 | . 2 ⊢ (Ⅎ𝑥𝜓 → Ⅎ𝑥 ¬ 𝜓) | |
3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → Ⅎ𝑥 ¬ 𝜓) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 Ⅎwnf 1436 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-5 1423 ax-gen 1425 ax-ie2 1470 ax-4 1487 ax-ial 1514 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-fal 1337 df-nf 1437 |
This theorem is referenced by: nfned 2402 nfneld 2411 nfifd 3499 |
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