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Syntax Definition w3o 933
Description: Extend wff definition to include 3-way disjunction ('or').
Ref Expression
wph wff φ
wps wff ψ
wch wff χ
Ref Expression
w3o wff (φ ψ χ)

See definition df-3or 935 for more information.

Colors of variables: wff setvar class
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