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Mirrors > Home > MPE Home > Th. List > notnotriOLD | Structured version Visualization version GIF version |
Description: Obsolete proof of notnotri 126 as of 15-Jul-2021 . (Contributed by NM, 27-Feb-2008.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
notnotri.1 | ⊢ ¬ ¬ 𝜑 |
Ref | Expression |
---|---|
notnotriOLD | ⊢ 𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | notnotri.1 | . 2 ⊢ ¬ ¬ 𝜑 | |
2 | notnotr 125 | . 2 ⊢ (¬ ¬ 𝜑 → 𝜑) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ 𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem is referenced by: (None) |
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