Discrete Mathematics & Theoretical Computer Science, Vol 10, No 1 (2008)

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Interaction properties of relational periods

Tomi Kärki, Tero Harju, Vesa Halava


We consider relational periods where the relation is a compatibility relation on words induced by a relation on letters. We introduce three types of periods, namely global, external and local relational periods, and we compare their properties by proving variants of the theorem of Fine and Wilf for these periods.

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