theorem Th6: :: GLCOLO00:6

for G2 being _Graph
for v being Vertex of G2
for e, w, x being object
for G1 being addAdjVertex of G2,v,e,w
for f being VColoring of G2 st not e in the_Edges_of G2 & not w in the_Vertices_of G2 holds
f +* (w .--> x) is VColoring of G1