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We give sufficient conditions for a graph to have a (g، نويسنده , , f)-factor. For example، نويسنده , , we prove that a graph G has a (g، نويسنده , , f)-factor if g(v) < f(v) for all vertices v of G and g(x)/degG(x) ? f (y)/degG(y) for all adjacent vertices x and y of G.، نويسنده ,
