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Syntax Definition w3a 871
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 873 for more information.

Colors of variables: wff set class
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