let A be non empty set ; :: thesis: for L being lower-bounded LATTICE
for d being BiFunction of A,L st d is zeroed holds
for q being QuadrSeq of d
for O being Ordinal holds ConsecutiveDelta2 q,O is zeroed

let L be lower-bounded LATTICE; :: thesis: for d being BiFunction of A,L st d is zeroed holds
for q being QuadrSeq of d
for O being Ordinal holds ConsecutiveDelta2 q,O is zeroed

let d be BiFunction of A,L; :: thesis: ( d is zeroed implies for q being QuadrSeq of d
for O being Ordinal holds ConsecutiveDelta2 q,O is zeroed )

assume A1: d is zeroed ; :: thesis: for q being QuadrSeq of d
for O being Ordinal holds ConsecutiveDelta2 q,O is zeroed

let q be QuadrSeq of d; :: thesis: for O being Ordinal holds ConsecutiveDelta2 q,O is zeroed
let O be Ordinal; :: thesis: ConsecutiveDelta2 q,O is zeroed
defpred S1[ Ordinal] means ConsecutiveDelta2 q,$1 is zeroed ;
A2: S1[ {} ]
proof
let z be Element of ConsecutiveSet2 A,{} ; :: according to LATTICE5:def 7 :: thesis: (ConsecutiveDelta2 q,{} ) . z,z = Bottom L
reconsider z' = z as Element of A by Th15;
thus (ConsecutiveDelta2 q,{} ) . z,z = d . z',z' by Th19
.= Bottom L by A1, LATTICE5:def 7 ; :: thesis: verum
end;
A3: for O1 being Ordinal st S1[O1] holds
S1[ succ O1]
proof
let O1 be Ordinal; :: thesis: ( S1[O1] implies S1[ succ O1] )
assume ConsecutiveDelta2 q,O1 is zeroed ; :: thesis: S1[ succ O1]
then A4: new_bi_fun2 (ConsecutiveDelta2 q,O1),(Quadr2 q,O1) is zeroed by Th10;
let z be Element of ConsecutiveSet2 A,(succ O1); :: according to LATTICE5:def 7 :: thesis: (ConsecutiveDelta2 q,(succ O1)) . z,z = Bottom L
reconsider z' = z as Element of new_set2 (ConsecutiveSet2 A,O1) by Th16;
ConsecutiveDelta2 q,(succ O1) = new_bi_fun2 (BiFun (ConsecutiveDelta2 q,O1),(ConsecutiveSet2 A,O1),L),(Quadr2 q,O1) by Th20
.= new_bi_fun2 (ConsecutiveDelta2 q,O1),(Quadr2 q,O1) by LATTICE5:def 16 ;
hence (ConsecutiveDelta2 q,(succ O1)) . z,z = (new_bi_fun2 (ConsecutiveDelta2 q,O1),(Quadr2 q,O1)) . z',z'
.= Bottom L by A4, LATTICE5:def 7 ;
:: thesis: verum
end;
A5: for O1 being Ordinal st O1 <> {} & O1 is limit_ordinal & ( for O2 being Ordinal st O2 in O1 holds
S1[O2] ) holds
S1[O1]
proof
let O2 be Ordinal; :: thesis: ( O2 <> {} & O2 is limit_ordinal & ( for O2 being Ordinal st O2 in O2 holds
S1[O2] ) implies S1[O2] )

assume A6: ( O2 <> {} & O2 is limit_ordinal & ( for O1 being Ordinal st O1 in O2 holds
ConsecutiveDelta2 q,O1 is zeroed ) ) ; :: thesis: S1[O2]
deffunc H1( Ordinal) -> BiFunction of (ConsecutiveSet2 A,$1),L = ConsecutiveDelta2 q,$1;
consider Ls being T-Sequence such that
A7: ( dom Ls = O2 & ( for O1 being Ordinal st O1 in O2 holds
Ls . O1 = H1(O1) ) ) from ORDINAL2:sch 2();
A8: ConsecutiveDelta2 q,O2 = union (rng Ls) by A6, A7, Th21;
deffunc H2( Ordinal) -> set = ConsecutiveSet2 A,$1;
consider Ts being T-Sequence such that
A9: ( dom Ts = O2 & ( for O1 being Ordinal st O1 in O2 holds
Ts . O1 = H2(O1) ) ) from ORDINAL2:sch 2();
A10: ConsecutiveSet2 A,O2 = union (rng Ts) by A6, A9, Th17;
set CS = ConsecutiveSet2 A,O2;
reconsider f = union (rng Ls) as BiFunction of (ConsecutiveSet2 A,O2),L by A8;
f is zeroed
proof
let x be Element of ConsecutiveSet2 A,O2; :: according to LATTICE5:def 7 :: thesis: f . x,x = Bottom L
consider y being set such that
A11: ( x in y & y in rng Ts ) by A10, TARSKI:def 4;
consider o being set such that
A12: ( o in dom Ts & y = Ts . o ) by A11, FUNCT_1:def 5;
reconsider o = o as Ordinal by A12;
A13: x in ConsecutiveSet2 A,o by A9, A11, A12;
A14: Ls . o = ConsecutiveDelta2 q,o by A7, A9, A12;
then reconsider h = Ls . o as BiFunction of (ConsecutiveSet2 A,o),L ;
A15: h is zeroed
proof
let z be Element of ConsecutiveSet2 A,o; :: according to LATTICE5:def 7 :: thesis: h . z,z = Bottom L
A16: ConsecutiveDelta2 q,o is zeroed by A6, A9, A12;
thus h . z,z = (ConsecutiveDelta2 q,o) . z,z by A7, A9, A12
.= Bottom L by A16, LATTICE5:def 7 ; :: thesis: verum
end;
ConsecutiveDelta2 q,o in rng Ls by A7, A9, A12, A14, FUNCT_1:def 5;
then A17: h c= f by A14, ZFMISC_1:92;
reconsider x' = x as Element of ConsecutiveSet2 A,o by A9, A11, A12;
dom h = [:(ConsecutiveSet2 A,o),(ConsecutiveSet2 A,o):] by FUNCT_2:def 1;
then [x,x] in dom h by A13, ZFMISC_1:106;
hence f . x,x = h . x',x' by A17, GRFUNC_1:8
.= Bottom L by A15, LATTICE5:def 7 ;
:: thesis: verum
end;
hence S1[O2] by A6, A7, Th21; :: thesis: verum
end;
for O being Ordinal holds S1[O] from ORDINAL2:sch 1(A2, A3, A5);
hence ConsecutiveDelta2 q,O is zeroed ; :: thesis: verum