let p, q, r be Element of CQC-WFF ; :: thesis: ( p => q in TAUT implies (q => r) => (p => r) in TAUT )
assume A1: p => q in TAUT ; :: thesis: (q => r) => (p => r) in TAUT
(p => q) => ((q => r) => (p => r)) in TAUT by Th1;
hence (q => r) => (p => r) in TAUT by A1, CQC_THE1:82; :: thesis: verum