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Syntax Definition wa 103
Description: Extend wff definition to include conjunction ('and').
Hypotheses
Ref Expression
wph wff 𝜑
wps wff 𝜓
Assertion
Ref Expression
wa wff (𝜑𝜓)

This syntax is primitive. The first axiom using it is ax-ia1 105.

Colors of variables: wff set class
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