let N be complete Lawson meet-continuous TopLattice; :: thesis: ( N is continuous iff for x being Element of N holds x = "\/" ( { (inf V) where V is Subset of N : ( x in V & V in lambda N ) } ,N) )
consider S being complete Scott TopAugmentation of N;
A1: RelStr(# the carrier of S, the InternalRel of S #) = RelStr(# the carrier of N, the InternalRel of N #) by YELLOW_9:def 4;

hereby :: thesis: ( ( for x being Element of N holds x = "\/" ( { (inf V) where V is Subset of N : ( x in V & V in lambda N ) } ,N) ) implies N is continuous )

assume A2: N is continuous ; :: thesis: for x being Element of N holds x = "\/" ( { (inf V) where V is Subset of N : ( x in V & V in lambda N ) } ,N)
then A3: for x being Element of S ex J being Basis of x st
for Y being Subset of S st Y in J holds
( Y is open & Y is filtered ) by WAYBEL14:35;
let x be Element of N; :: thesis: x = "\/" ( { (inf V) where V is Subset of N : ( x in V & V in lambda N ) } ,N)
InclPoset (sigma S) is continuous by A2, WAYBEL14:36;
hence x = "\/" ( { (inf X) where X is Subset of S : ( x in X & X in sigma S ) } ,S) by A3, A1, WAYBEL14:37
.= "\/" ( { (inf X) where X is Subset of S : ( x in X & X in sigma S ) } ,N) by A1, YELLOW_0:17, YELLOW_0:26
.= "\/" ( { (inf V) where V is Subset of N : ( x in V & V in lambda N ) } ,N) by Th34 ;
:: thesis: verum

end;

assume A4: for x being Element of N holds x = "\/" ( { (inf V) where V is Subset of N : ( x in V & V in lambda N ) } ,N) ; :: thesis: N is continuous

now

let x be Element of S; :: thesis: x = "\/" ( { (inf V) where V is Subset of S : ( x in V & V in sigma S ) } ,S)
thus x = "\/" ( { (inf V) where V is Subset of N : ( x in V & V in lambda N ) } ,N) by A1, A4
.= "\/" ( { (inf V) where V is Subset of S : ( x in V & V in sigma S ) } ,N) by A1, Th34
.= "\/" ( { (inf V) where V is Subset of S : ( x in V & V in sigma S ) } ,S) by A1, YELLOW_0:17, YELLOW_0:26 ; :: thesis: verum

end;

then S is continuous by WAYBEL14:38;
hence N is continuous by A1, YELLOW12:15; :: thesis: verum