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Mirrors > Home > MPE Home > Th. List > nfndOLD | Structured version Visualization version GIF version |
Description: Obsolete proof of nfnd 1769 as of 6-Oct-2021. (Contributed by Mario Carneiro, 24-Sep-2016.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
nfndOLD.1 | ⊢ (𝜑 → Ⅎ𝑥𝜓) |
Ref | Expression |
---|---|
nfndOLD | ⊢ (𝜑 → Ⅎ𝑥 ¬ 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfndOLD.1 | . 2 ⊢ (𝜑 → Ⅎ𝑥𝜓) | |
2 | nfntOLD 2197 | . 2 ⊢ (Ⅎ𝑥𝜓 → Ⅎ𝑥 ¬ 𝜓) | |
3 | 1, 2 | syl 17 | 1 ⊢ (𝜑 → Ⅎ𝑥 ¬ 𝜓) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ℲwnfOLD 1700 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-12 2034 |
This theorem depends on definitions: df-bi 196 df-or 384 df-ex 1696 df-nf 1701 df-nfOLD 1712 |
This theorem is referenced by: nfandOLD 2220 |
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