deffunc H₁( set , Element of QC-WFF ) -> Element of Funcs (F₁(),F₂()) = F₇((bound_in $2),$1,(the_scope_of $2));
deffunc H₂( set , set , Element of QC-WFF ) -> Element of Funcs (F₁(),F₂()) = F₆($1,$2,(the_left_argument_of $3),(the_right_argument_of $3));
deffunc H₃( set , Element of QC-WFF ) -> Element of Funcs (F₁(),F₂()) = F₅($1,(the_argument_of $2));
deffunc H₄( Element of QC-WFF ) -> Element of Funcs (F₁(),F₂()) = F₄((the_arity_of (the_pred_symbol_of $1)),(the_pred_symbol_of $1),(the_arguments_of $1));
consider F being Function of QC-WFF,(Funcs (F₁(),F₂())) such that
A1: ( F . VERUM = F₃() & ( for p being Element of QC-WFF holds
( ( p is atomic implies F . p = H₄(p) ) & ( p is negative implies F . p = H₃(F . (the_argument_of p),p) ) & ( p is conjunctive implies F . p = H₂(F . (the_left_argument_of p),F . (the_right_argument_of p),p) ) & ( p is universal implies F . p = H₁(F . (the_scope_of p),p) ) ) ) ) from CQC_SIM1:sch 1();
reconsider G = F | CQC-WFF as Function of CQC-WFF,(Funcs (F₁(),F₂())) by FUNCT_2:38;
take G ; :: thesis: ( G . VERUM = F₃() & ( for k being Element of NAT
for l being CQC-variable_list of k
for P being QC-pred_symbol of k holds G . (P ! l) = F₄(k,P,l) ) & ( for r, s being Element of CQC-WFF
for x being Element of bound_QC-variables holds
( G . ('not' r) = F₅((G . r),r) & G . (r '&' s) = F₆((G . r),(G . s),r,s) & G . (All (x,r)) = F₇(x,(G . r),r) ) ) )
thus G . VERUM = F₃() by A1, FUNCT_1:72; :: thesis: ( ( for k being Element of NAT
for l being CQC-variable_list of k
for P being QC-pred_symbol of k holds G . (P ! l) = F₄(k,P,l) ) & ( for r, s being Element of CQC-WFF
for x being Element of bound_QC-variables holds
( G . ('not' r) = F₅((G . r),r) & G . (r '&' s) = F₆((G . r),(G . s),r,s) & G . (All (x,r)) = F₇(x,(G . r),r) ) ) )
thus for k being Element of NAT
for l being CQC-variable_list of k
for P being QC-pred_symbol of k holds G . (P ! l) = F₄(k,P,l) :: thesis: for r, s being Element of CQC-WFF
for x being Element of bound_QC-variables holds
( G . ('not' r) = F₅((G . r),r) & G . (r '&' s) = F₆((G . r),(G . s),r,s) & G . (All (x,r)) = F₇(x,(G . r),r) )

proof

let k be Element of NAT ; :: thesis: for l being CQC-variable_list of k
for P being QC-pred_symbol of k holds G . (P ! l) = F₄(k,P,l)
let l be CQC-variable_list of k; :: thesis: for P being QC-pred_symbol of k holds G . (P ! l) = F₄(k,P,l)
let P be QC-pred_symbol of k; :: thesis: G . (P ! l) = F₄(k,P,l)
A2: the_arity_of P = k by QC_LANG1:35;
A3: P ! l is atomic by QC_LANG1:def 17;
then A4: the_arguments_of (P ! l) = l by QC_LANG1:def 22;
A5: the_pred_symbol_of (P ! l) = P by A3, QC_LANG1:def 21;
thus G . (P ! l) = F . (P ! l) by FUNCT_1:72
.= F₄(k,P,l) by A1, A3, A4, A5, A2 ; :: thesis: verum

end;

let r, s be Element of CQC-WFF ; :: thesis: for x being Element of bound_QC-variables holds
( G . ('not' r) = F₅((G . r),r) & G . (r '&' s) = F₆((G . r),(G . s),r,s) & G . (All (x,r)) = F₇(x,(G . r),r) )
let x be Element of bound_QC-variables ; :: thesis: ( G . ('not' r) = F₅((G . r),r) & G . (r '&' s) = F₆((G . r),(G . s),r,s) & G . (All (x,r)) = F₇(x,(G . r),r) )
set r9 = G . r;
set s9 = G . s;
A6: G . r = F . r by FUNCT_1:72;
A7: 'not' r is negative by QC_LANG1:def 18;
then A8: the_argument_of ('not' r) = r by QC_LANG1:def 23;
thus G . ('not' r) = F . ('not' r) by FUNCT_1:72
.= F₅((G . r),r) by A1, A6, A7, A8 ; :: thesis: ( G . (r '&' s) = F₆((G . r),(G . s),r,s) & G . (All (x,r)) = F₇(x,(G . r),r) )
A9: G . s = F . s by FUNCT_1:72;
A10: r '&' s is conjunctive by QC_LANG1:def 19;
then A11: the_left_argument_of (r '&' s) = r by QC_LANG1:def 24;
A12: the_right_argument_of (r '&' s) = s by A10, QC_LANG1:def 25;
thus G . (r '&' s) = F . (r '&' s) by FUNCT_1:72
.= F₆((G . r),(G . s),r,s) by A1, A6, A9, A10, A11, A12 ; :: thesis: G . (All (x,r)) = F₇(x,(G . r),r)
A13: All (x,r) is universal by QC_LANG1:def 20;
then A14: bound_in (All (x,r)) = x by QC_LANG1:def 26;
A15: the_scope_of (All (x,r)) = r by A13, QC_LANG1:def 27;
thus G . (All (x,r)) = F . (All (x,r)) by FUNCT_1:72
.= F₇(x,(G . r),r) by A1, A6, A13, A14, A15 ; :: thesis: verum