let G be finite _Graph; :: thesis: for L being MCS:Labeling of G
for v, x being set st x in dom (L `1) holds
(L `2) . x = ((MCS:LabelAdjacent (L,v)) `2) . x
let L be MCS:Labeling of G; :: thesis: for v, x being set st x in dom (L `1) holds
(L `2) . x = ((MCS:LabelAdjacent (L,v)) `2) . x
let v, x be set ; :: thesis: ( x in dom (L `1) implies (L `2) . x = ((MCS:LabelAdjacent (L,v)) `2) . x )
assume A1: x in dom (L `1) ; :: thesis: (L `2) . x = ((MCS:LabelAdjacent (L,v)) `2) . x
set V2G = L `2 ;
set VLG = L `1 ;
set GL = MCS:LabelAdjacent (L,v);
set V2 = (MCS:LabelAdjacent (L,v)) `2 ;
not x in (G .AdjacentSet {v}) \ (dom (L `1)) by A1, XBOOLE_0:def 5;
hence (L `2) . x = ((MCS:LabelAdjacent (L,v)) `2) . x by Def3; :: thesis: verum