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Syntax Definition w3a 983
Description: Extend wff definition to include three-way conjunction ('and').
Hypotheses
Ref Expression
wph wff ph
wps wff ps
wch wff ch
Assertion
Ref Expression
w3a wff ( ph /\ ps /\ ch )
See definition df-3an 985 for more information.
Colors of variables: wff setvar class
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