let Al be QC-alphabet ; :: thesis: for A being non empty set
for p being Element of CQC-WFF Al
for J being interpretation of Al,A holds J |= (('not' p) => p) => p
let A be non empty set ; :: thesis: for p being Element of CQC-WFF Al
for J being interpretation of Al,A holds J |= (('not' p) => p) => p
let p be Element of CQC-WFF Al; :: thesis: for J being interpretation of Al,A holds J |= (('not' p) => p) => p
let J be interpretation of Al,A; :: thesis: J |= (('not' p) => p) => p
let v be Element of Valuations_in (Al,A); :: according to VALUAT_1:def 8 :: thesis: J,v |= (('not' p) => p) => p
thus J,v |= (('not' p) => p) => p by Th34; :: thesis: verum