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Axiom ax-mdas 9
Description: is associative.
Assertion
Ref Expression
ax-mdas (~ ((𝜑𝜓) ⅋ 𝜒) ⅋ (𝜑 ⅋ (𝜓𝜒)))

Detailed syntax breakdown of Axiom ax-mdas
StepHypRef Expression
1 wph . . . . 5 wff 𝜑
2 wps . . . . 5 wff 𝜓
31, 2wmd 2 . . . 4 wff (𝜑𝜓)
4 wch . . . 4 wff 𝜒
53, 4wmd 2 . . 3 wff ((𝜑𝜓) ⅋ 𝜒)
65wneg 3 . 2 wff ~ ((𝜑𝜓) ⅋ 𝜒)
72, 4wmd 2 . . 3 wff (𝜓𝜒)
81, 7wmd 2 . 2 wff (𝜑 ⅋ (𝜓𝜒))
96, 8wmd 2 1 wff (~ ((𝜑𝜓) ⅋ 𝜒) ⅋ (𝜑 ⅋ (𝜓𝜒)))
Colors of variables: wff var nilad
This axiom is referenced by:  mdasd  13  mdasi  14  mdasr  15  mdas  110
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