Abstract
Dekking (Adv. Math. 44:78–104, 1982; J. Comb. Theory Ser. A 32:315–320, 1982) provided an important method to compute the boundaries of lattice rep-tiles as a ‘recurrent set’ on a free group of a finite alphabet. That is, those tilings are generated by lattice translations of a single tile, and there is an expanding linear map that carries tiles to unions of tiles. The boundary of the tile is identified with a sequence of words in the alphabet obtained from an expanding endomorphism (substitution) on the alphabet. In this paper, Dekking’s construction is generalized to address tilings with more than one tile, and to have the elements of the tilings be generated by both translation and rotations. Examples that fall within the scope of our main result include self-replicating multi-tiles, self-replicating tiles for crystallographic tilings and aperiodic tilings.
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