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C.L.Monma and V.K.Wei [1986, J. Comb. Theory, Ser-B, 41, 141-181] proposed a unified approach to characterize several subclasses of chordal graphs using clique separator. The characterizations so obtained are called separator theorems. Separator theorems play an important role in designing algorithms in subclasses of chordal graphs. In this paper, we obtain separator theorems for interval graphs and proper interval graphs, which are subclasses of chordal graphs, following the framework of Monma and Wei.
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