let A be QC-alphabet ; :: thesis: for p being Element of CQC-WFF A holds p 'or' ('not' p) in TAUT A
let p be Element of CQC-WFF A; :: thesis: p 'or' ('not' p) in TAUT A
('not' p) => ('not' p) in TAUT A by LUKASI_1:4;
hence p 'or' ('not' p) in TAUT A by Lm1; :: thesis: verum