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Syntax Definition w-bnj17 31987
Description: Extend wff notation with the 4-way conjunction. (New usage is discouraged.)
Hypotheses
Ref Expression
wph  wff  ph
wps  wff  ps
wch  wff  ch
wth  wff  th
Assertion
Ref Expression
w-bnj17  wff  ( ph  /\ 
ps  /\  ch  /\  th )

See definition df-bnj17 31988 for more information.

Colors of variables: wff setvar class
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