let p be Element of CQC-WFF ; :: thesis: for x being bound_QC-variable holds (All x,p) => p is valid
let x be bound_QC-variable; :: thesis: (All x,p) => p is valid
(All x,p) => p in TAUT by Th33;
hence (All x,p) => p is valid by Lm13; :: thesis: verum