Part of the Lecture Notes in Computer Science book series (LNCS, volume 104)
A family of graphs with expensive depth-reduction
A family of directed acyclic graphs Gn with n nodes and n lg2 n edges is constructed. It is necessary to remove Ω(n lg2 n) edges, in order to reduce depth to nɛ−0≤ɛ<1 −.
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© Springer-Verlag Berlin Heidelberg 1981