let p, q be Element of CQC-WFF ; :: thesis: (p => q) => (('not' p) 'or' q) in TAUT
A1: ('not' ('not' p)) => q = ('not' p) 'or' q by Lm1;
A2: ('not' ('not' p)) => p in TAUT by LUKASI_1:25;
(('not' ('not' p)) => p) => ((p => q) => (('not' ('not' p)) => q)) in TAUT by LUKASI_1:1;
hence (p => q) => (('not' p) 'or' q) in TAUT by A1, A2, CQC_THE1:82; :: thesis: verum