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Syntax Definition w3a 934
Description: Extend wff definition to include 3-way conjunction ('and').
Hypotheses
Ref Expression
wph wff φ
wps wff ψ
wch wff χ
Assertion
Ref Expression
w3a wff (φ ∧ ψ ∧ χ)
See definition df-3an 936 for more information.
Colors of variables: wff setvar class
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