:: deftheorem defines |= CALCUL_1:def 12 :
for Al being QC-alphabet
for X being Subset of (CQC-WFF Al)
for p being Element of CQC-WFF Al holds
( X |= p iff for A being non empty set
for J being interpretation of Al,A
for v being Element of Valuations_in (Al,A) st J,v |= X holds
J,v |= p );