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Theorem rblem7 1757
Description: Used to rederive the Lukasiewicz axioms from Russell-Bernays'. (Contributed by Anthony Hart, 19-Aug-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypothesis
Ref Expression
rblem7.1 ¬ (¬ (¬ 𝜑𝜓) ∨ ¬ (¬ 𝜓𝜑))
Assertion
Ref Expression
rblem7 𝜓𝜑)

Proof of Theorem rblem7
StepHypRef Expression
1 rblem7.1 . 2 ¬ (¬ (¬ 𝜑𝜓) ∨ ¬ (¬ 𝜓𝜑))
2 rb-ax3 1748 . . 3 (¬ ¬ (¬ 𝜓𝜑) ∨ (¬ (¬ 𝜑𝜓) ∨ ¬ (¬ 𝜓𝜑)))
3 rblem5 1755 . . 3 (¬ (¬ ¬ (¬ 𝜓𝜑) ∨ (¬ (¬ 𝜑𝜓) ∨ ¬ (¬ 𝜓𝜑))) ∨ (¬ ¬ (¬ (¬ 𝜑𝜓) ∨ ¬ (¬ 𝜓𝜑)) ∨ (¬ 𝜓𝜑)))
42, 3anmp 1745 . 2 (¬ ¬ (¬ (¬ 𝜑𝜓) ∨ ¬ (¬ 𝜓𝜑)) ∨ (¬ 𝜓𝜑))
51, 4anmp 1745 1 𝜓𝜑)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wo 843
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 208  df-an 397  df-or 844
This theorem is referenced by:  re2luk1  1759  re2luk2  1760  re2luk3  1761
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