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Let = ( , , ) be a connected weighted graph in which each edge in has weight ( ) > 0 . Suppose 1

Let =(,,)
be a connected weighted graph in which each edge in
has weight ()>0
. Suppose 1
is a Shortest Path Tree (SPT) of
rooted at some source vertex
, and 2
is a Minimum Spanning Tree (MST) of
. Now consider keeping the same set of vertices and edges, but modifying the edge weights to get a modified graph =(,,)
, where the modified edge weights are defined as ()=(4+())(7+())
, for each edge in
.
Then, as a set of edges in
,

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