91-29 van Enter A.C.D., Miekisz J.
How should one define a (weak) crystal? (22K, Latex) Sep 19, 91
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Abstract. We compare two proposals for the study of positional long-range order: one in terms of the spectrum of the translation operator, the other in terms of the Fourier spectrum. We point out that only the first one allows for the consideration of molecular, as opposed to atomic, (weakly) periodic structures. We illustrate this point on the Thue-Morse system.

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