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