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Mar 10, 2017 at 13:03 comment added Max Alekseyev Also, there may exist edges even within the same level (except $L_0$).
Mar 10, 2017 at 12:32 comment added Max Alekseyev In other words, $L_j$ is the set of vertices $v$ such that a shortest path from a source to $v$ has length $j$. Notice that in such layering there may exist "back edges" from $L_i$ to $L_j$ with $i>j>0$. But you do not take them into account when consider the "deleted edges".
Mar 10, 2017 at 7:41 history edited usul CC BY-SA 3.0
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Mar 10, 2017 at 7:34 history edited usul CC BY-SA 3.0
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Mar 10, 2017 at 7:25 history answered usul CC BY-SA 3.0