Discussiones Mathematicae Graph Theory 27(2) (2007) 359-371
doi: 10.7151/dmgt.1367

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Hortensia Galeana-Sánchez  and  Ricardo Gómez

Instituto de Matemáticas de la Universidad Nacional Autónoma de México
Circuito Exterior, Ciudad Universitaria C.P. 04510, México D.F. México


Line digraphs can be obtained by sequences of state splittings, a particular kind of operation widely used in symbolic dynamics [12]. Properties of line digraphs inherited from the source have been studied, for instance in [7] Harminc showed that the cardinalities of the sets of kernels and solutions (kernel's dual definition) of a digraph and its line digraph coincide. We extend this for (k,l)-kernels in the context of state splittings and also look at (k,l)-semikernels, k-Grundy functions and their duals.

Keywords: state splitting, line digraph, kernel, Grundy function, duality.

2000 Mathematics Subject Classification: 05C20.


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Received 19 May 2006
Revised 30 November 2006
Accepted 30 November 2006