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Mirrors > Home > MPE Home > Th. List > nexdOLD | Structured version Visualization version GIF version |
Description: Obsolete proof of nexd 2089 as of 6-Oct-2021. (Contributed by Mario Carneiro, 24-Sep-2016.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
nexdOLD.1 | ⊢ Ⅎ𝑥𝜑 |
nexdOLD.2 | ⊢ (𝜑 → ¬ 𝜓) |
Ref | Expression |
---|---|
nexdOLD | ⊢ (𝜑 → ¬ ∃𝑥𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nexdOLD.1 | . . 3 ⊢ Ⅎ𝑥𝜑 | |
2 | 1 | nfriOLD 2189 | . 2 ⊢ (𝜑 → ∀𝑥𝜑) |
3 | nexdOLD.2 | . 2 ⊢ (𝜑 → ¬ 𝜓) | |
4 | 2, 3 | nexdh 1792 | 1 ⊢ (𝜑 → ¬ ∃𝑥𝜓) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∃wex 1704 ℲwnfOLD 1709 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-12 2047 |
This theorem depends on definitions: df-bi 197 df-ex 1705 df-nfOLD 1721 |
This theorem is referenced by: (None) |
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