let p, q, r be Element of CQC-WFF ; :: thesis: ( p => (q => r) in TAUT implies (p => q) => (p => r) in TAUT )
assume A1: p => (q => r) in TAUT ; :: thesis: (p => q) => (p => r) in TAUT
(p => (q => r)) => ((p => q) => (p => r)) in TAUT by Th11;
hence (p => q) => (p => r) in TAUT by A1, CQC_THE1:82; :: thesis: verum