let s, q, p be Element of MC-wff ; :: thesis: ( s => (q => p) in IPC-Taut & q in IPC-Taut implies s => p in IPC-Taut )
assume A1: ( s => (q => p) in IPC-Taut & q in IPC-Taut ) ; :: thesis: s => p in IPC-Taut
(s => (q => p)) => (q => (s => p)) in IPC-Taut by Th29;
then q => (s => p) in IPC-Taut by A1, Def14;
hence s => p in IPC-Taut by A1, Def14; :: thesis: verum