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It is known that a positive, compactly supported function   $f \in L^1(\mathbb R)$   can tile by translations only if the translation set is a finite union of periodic sets. We prove that this is not the case if   $f$   is allowed to have unbounded support. On the other hand, we also show that if the translation set has finite local complexity, then it must be periodic, even if the support of   $f$   is unbounded.

On Non-Periodic Tilings of the Real Line by a Function