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Syntax Definition wnor 1525
Description: Extend wff definition to include joint denial ("nor").
Hypotheses
Ref Expression
wph wff 𝜑
wps wff 𝜓
Assertion
Ref Expression
wnor wff (𝜑 𝜓)

See definition df-nor 1526 for more information.

Colors of variables: wff setvar class
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