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Syntax Definition w3a 973
Description: Extend wff definition to include 3-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 975 for more information.
Colors of variables: wff set class
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