theorem Th72: :: GLIB_013:72

for G2 being _Graph
for v, w being Vertex of G2
for e being object
for G1 being addEdge of G2,v,e,w holds
( not v <> w or G1 .minOutDegree() = G2 .minOutDegree() or G1 .minOutDegree() = (v .outDegree()) +` 1 )