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Definition df-mc 106
Description: Times is the dual of Par.
Assertion
Ref Expression
df-mc ((𝜑𝜓) ⧟ ~ (~ 𝜑 ⅋ ~ 𝜓))

Detailed syntax breakdown of Definition df-mc
StepHypRef Expression
1 wph . . 3 wff 𝜑
2 wps . . 3 wff 𝜓
31, 2wmc 105 . 2 wff (𝜑𝜓)
41wneg 3 . . . 4 wff ~ 𝜑
52wneg 3 . . . 4 wff ~ 𝜓
64, 5wmd 2 . . 3 wff (~ 𝜑 ⅋ ~ 𝜓)
76wneg 3 . 2 wff ~ (~ 𝜑 ⅋ ~ 𝜓)
83, 7wlb 55 1 wff ((𝜑𝜓) ⧟ ~ (~ 𝜑 ⅋ ~ 𝜓))
Colors of variables: wff var nilad
This definition is referenced by:  mcco  115
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