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Decomposition of integral self‐affine multi‐tiles

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Abstract In contrast to the situation with self‐affine tiles, the representation of self‐affine multi‐tiles may not be unique (for a fixed dilation matrix). Let be an integral self‐affine multi‐tile associated with an integral, expansive matrix B and let K tile by translates of . In this work, we propose a stepwise method to decompose K into measure disjoint pieces  satisfying in such a way that the collection of sets forms an integral self‐affine collection associated with the matrix B and this with a minimum number of pieces . When used on a given measurable subset K which tiles by translates of , this decomposition terminates after finitely many steps if and only if the set K is an integral self‐affine multi‐tile. Furthermore, we show that the minimal decomposition we provide is unique.

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