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Hamiltonian Path in Split Graphs- a Dichotomy
In this paper, we investigate Hamiltonian path problem in the context of
split graphs, and produce a dichotomy result on the complexity of the problem.
Our main result is a deep investigation of the structure of -free
split graphs in the context of Hamiltonian path problem, and as a consequence,
we obtain a polynomial-time algorithm to the Hamiltonian path problem in
-free split graphs. We close this paper with the hardness result: we
show that, unless P=NP, Hamiltonian path problem is NP-complete in
-free split graphs by reducing from Hamiltonian cycle problem in
-free split graphs. Thus this paper establishes a "thin complexity
line" separating NP-complete instances and polynomial-time solvable instances.Comment: 39 pages, 4 figures, CALDAM 201