let A be QC-alphabet ; :: thesis:
let t be QC-symbol of A; :: thesis:
let p, q be Element of CQC-WFF A; :: thesis:
let f be Element of Funcs ((bound_QC-variables A),(bound_QC-variables A)); :: thesis:
let K be Element of Fin (bound_QC-variables A); :: thesis:
assume that
A1: [q,t,K,f] in SepQuadruples p and
A2: [q,t,K,f] <> [p,(index p),({}. (bound_QC-variables A)),(id (bound_QC-variables A))] and
A3: not [('not' q),t,K,f] in SepQuadruples p and
A4: for r being Element of CQC-WFF A holds not [(q '&' r),t,K,f] in SepQuadruples p and
A5: for r being Element of CQC-WFF A
for u being QC-symbol of A holds
( not t = u + (QuantNbr r) or not [(r '&' q),u,K,f] in SepQuadruples p ) and
A6: for x being Element of bound_QC-variables A
for u being QC-symbol of A
for h being Element of Funcs ((bound_QC-variables A),(bound_QC-variables A)) holds
( not u ++ = t or not h +* ({x} --> (x. u)) = f or ( not [(All (x,q)),u,K,h] in SepQuadruples p & not [(All (x,q)),u,(K \ {x}),h] in SepQuadruples p ) ) ; :: thesis:
reconsider Y = (SepQuadruples p) \ {[q,t,K,f]} as Subset of [:(CQC-WFF A),(QC-symbols A),(Fin (bound_QC-variables A)),(Funcs ((bound_QC-variables A),(bound_QC-variables A))):] ;
A7: SepQuadruples p is_Sep-closed_on p by Def13;
A8: for q being Element of CQC-WFF A
for t being QC-symbol of A
for K being Element of Fin (bound_QC-variables A)
for f being Element of Funcs ((bound_QC-variables A),(bound_QC-variables A)) st [('not' q),t,K,f] in Y holds
[q,t,K,f] in Y

proof

let s be Element of CQC-WFF A; :: thesis:
let u be QC-symbol of A; :: thesis:
let L be Element of Fin (bound_QC-variables A); :: thesis:
let h be Element of Funcs ((bound_QC-variables A),(bound_QC-variables A)); :: thesis:
assume A9: [('not' s),u,L,h] in Y ; :: thesis:
then ( s <> q or u <> t or L <> K or f <> h ) by A3, XBOOLE_0:def 5;
then A10: [s,u,L,h] <> [q,t,K,f] by XTUPLE_0:5;
[('not' s),u,L,h] in SepQuadruples p by A9, XBOOLE_0:def 5;
then [s,u,L,h] in SepQuadruples p by A7;
hence [s,u,L,h] in Y by A10, ZFMISC_1:56; :: thesis:

end;

A11: for q, r being Element of CQC-WFF A
for t being QC-symbol of A
for K being Element of Fin (bound_QC-variables A)
for f being Element of Funcs ((bound_QC-variables A),(bound_QC-variables A)) st [(q '&' r),t,K,f] in Y holds
( [q,t,K,f] in Y & [r,(t + (QuantNbr q)),K,f] in Y )

proof

let s, r be Element of CQC-WFF A; :: thesis:
let u be QC-symbol of A; :: thesis:
let L be Element of Fin (bound_QC-variables A); :: thesis:
let h be Element of Funcs ((bound_QC-variables A),(bound_QC-variables A)); :: thesis:
assume [(s '&' r),u,L,h] in Y ; :: thesis:
then A12: [(s '&' r),u,L,h] in SepQuadruples p by XBOOLE_0:def 5;
then ( s <> q or u <> t or L <> K or f <> h ) by A4;
then A13: [s,u,L,h] <> [q,t,K,f] by XTUPLE_0:5;
[s,u,L,h] in SepQuadruples p by A7, A12;
hence [s,u,L,h] in Y by A13, ZFMISC_1:56; :: thesis:
( r <> q or L <> K or f <> h or u + (QuantNbr s) <> t ) by A5, A12;
then A14: [r,(u + (QuantNbr s)),L,h] <> [q,t,K,f] by XTUPLE_0:5;
[r,(u + (QuantNbr s)),L,h] in SepQuadruples p by A7, A12;
hence [r,(u + (QuantNbr s)),L,h] in Y by A14, ZFMISC_1:56; :: thesis:

end;

A15: Y c= SepQuadruples p by XBOOLE_1:36;
A16: for q being Element of CQC-WFF A
for x being Element of bound_QC-variables A
for t being QC-symbol of A
for K being Element of Fin (bound_QC-variables A)
for f being Element of Funcs ((bound_QC-variables A),(bound_QC-variables A)) st [(All (x,q)),t,K,f] in Y holds
[q,(t ++),(K \/ {x}),(f +* (x .--> (x. t)))] in Y

proof

let s be Element of CQC-WFF A; :: thesis:
let x be Element of bound_QC-variables A; :: thesis:
let u be QC-symbol of A; :: thesis:
let L be Element of Fin (bound_QC-variables A); :: thesis:
let h be Element of Funcs ((bound_QC-variables A),(bound_QC-variables A)); :: thesis:
assume A17: [(All (x,s)),u,L,h] in Y ; :: thesis:

now :: thesis:

assume that
A18: not [(All (x,q)),u,K,h] in SepQuadruples p and
A19: not [(All (x,q)),u,(K \ {x}),h] in SepQuadruples p ; :: thesis:
A20: ( s <> q or ( L <> K & L <> K \ {x} ) ) by A17, A18, A19, XBOOLE_0:def 5;
assume A21: s = q ; :: thesis:
assume A22: L \/ {x} = K ; :: thesis:
then K \ {x} = L \ {x} by XBOOLE_1:40;
hence contradiction by A20, A21, A22, ZFMISC_1:40, ZFMISC_1:57; :: thesis:

end;

then ( s <> q or u ++ <> t or L \/ {x} <> K or f <> h +* ({x} --> (x. u)) ) by A6;
then A23: [s,(u ++),(L \/ {x}),(h +* (x .--> (x. u)))] <> [q,t,K,f] by XTUPLE_0:5;
[(All (x,s)),u,L,h] in SepQuadruples p by A17, XBOOLE_0:def 5;
then [s,(u ++),(L \/ {x}),(h +* (x .--> (x. u)))] in SepQuadruples p by A7;
hence [s,(u ++),(L \/ {x}),(h +* (x .--> (x. u)))] in Y by A23, ZFMISC_1:56; :: thesis:

end;

[p,(index p),({}. (bound_QC-variables A)),(id (bound_QC-variables A))] in SepQuadruples p by A7;
then [p,(index p),({}. (bound_QC-variables A)),(id (bound_QC-variables A))] in Y by A2, ZFMISC_1:56;
then Y is_Sep-closed_on p by A8, A11, A16;
then SepQuadruples p c= Y by Def13;
then Y = SepQuadruples p by A15;
hence contradiction by A1, ZFMISC_1:57; :: thesis: