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Theorem fald 32996
Description: Refutation of falsity, in deduction form. (Contributed by Giovanni Mascellani, 24-Mar-2018.)
Assertion
Ref Expression
fald (𝜃 → ¬ ⊥)

Proof of Theorem fald
StepHypRef Expression
1 fal 1481 . 2 ¬ ⊥
21a1i 11 1 (𝜃 → ¬ ⊥)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wfal 1479
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 195  df-tru 1477  df-fal 1480
This theorem is referenced by: (None)
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