theorem :: GLIB_013:66

for G2 being _Graph
for V being set
for G1 being addVertices of G2,V st V \ (the_Vertices_of G2) <> {} holds
( G1 .minDegree() = 0 & G1 .minInDegree() = 0 & G1 .minOutDegree() = 0 )