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| Mirrors > Home > PE Home > Th. List > df-false-D2.5 | |||
| Description: Definition of False, '⊥'. |
| Ref | Expression |
|---|---|
| df-false-D2.5 | ⊢ (⊥ ↔ ¬ ⊤) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wff-false 157 | . 2 wff ⊥ | |
| 2 | wff-true 153 | . . 3 wff ⊤ | |
| 3 | 2 | wff-neg 9 | . 2 wff ¬ ⊤ |
| 4 | 1, 3 | wff-bi 104 | 1 wff (⊥ ↔ ¬ ⊤) |
| Colors of variables: wff objvar term class |
| This definition is referenced by: false-P2.15 159 |
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