let p, q be Element of CQC-WFF ; :: thesis: ( p '&' q in TAUT implies p in TAUT )
assume A1: p '&' q in TAUT ; :: thesis: p in TAUT
(p '&' q) => p in TAUT by Th19;
hence p in TAUT by A1, CQC_THE1:46; :: thesis: verum