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<b><font face="Arial, Helvetica, sans-serif" size="5" color="#FF0000">6.3 Minimum cost spanning trees</font><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">

<font color="#FF0000">cost of a spanning tree </font>of a weighted undirected graph is
 the sum of the costs (weights) of the edges in the spanning tree.

<font color="#FF0000"><i>a minimum cost spanning tree</i></font> is a spanning tree of least cost.

<font color="#FF0000">greedy method  </font>( design strategy ):
        <i><font color="#0033CC">Kruskal's      Prim's      sollin       algorithms</font></i>
 
solution must <font color="#FF0000">satisfy </font>the following <i><font color="#FF0000">constraints</font></i> :
    (1) we must  use only  edges within the graph
    (2) we must use exactly n - 1 edges
    (3) we may not use edges that would produce a cycle

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