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Mirrors > Home > MPE Home > Th. List > bifal | Structured version Visualization version GIF version |
Description: A contradiction is equivalent to falsehood. (Contributed by Mario Carneiro, 9-May-2015.) |
Ref | Expression |
---|---|
bifal.1 | ⊢ ¬ 𝜑 |
Ref | Expression |
---|---|
bifal | ⊢ (𝜑 ↔ ⊥) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bifal.1 | . 2 ⊢ ¬ 𝜑 | |
2 | fal 1551 | . 2 ⊢ ¬ ⊥ | |
3 | 1, 2 | 2false 375 | 1 ⊢ (𝜑 ↔ ⊥) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 206 ⊥wfal 1549 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 207 df-tru 1540 df-fal 1550 |
This theorem is referenced by: falantru 1572 dfnul4 4354 dfnul2 4355 dfnul4OLD 4359 abf 4429 ralnralall 4538 tgcgr4 28557 frgrregord013 30427 nrmo 36376 bj-ntrufal 36535 bicontr 38040 aibnbaif 46822 aifftbifffaibif 46836 atnaiana 46838 |
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