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Syntax Definition w3a 991
Description: Extend wff definition to include three-way conjunction ('and').
Ref Expression
wph  wff  ph
wps  wff  ps
wch  wff  ch
Ref Expression
w3a  wff  ( ph  /\ 
ps  /\  ch )

See definition df-3an 993 for more information.

Colors of variables: wff setvar class
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