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Definitions

A cut respects the set A of edges if no edge in A crosses the cut.



\psfig{figure=figures/f17-4.ps}

A = (V, E), V = {a, b, c, d}, E = {(a,b), (b,c)}

An edge is a light edge crossing a cut if its weight is the minimum of any edge crossing the cut.



\psfig{figure=figures/f17-5.ps}

(b,d) is the light edge


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