Interaction properties of relational periods
Vesa Halava, Tero Harju, Tomi Kärki · Discrete Mathematics & Theoretical Computer Science · 2008
Automata, Logic and Semantics 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.