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Stirring significantly increased net softening at each time point; specimens underwent significantly more bulk tissue loss (P less then 0.05). CLSM showed the erosive lesion deepened as exposure to acid increased, and that at the near surface (0-10 µm) FV and ΔFV increased rapidly for stirred solutions. The increase in pore space translated to a softer surface as measured by SMH. Conclusion This novel non-destructive method allows concurrent quantification of dental erosion by mineral loss as a function of depth, and qualitative characteris

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A compact space X is said to be minimal if there exists a map f X → X such that the forward orbit of any point is dense in X. We consider rigid minimal spaces, motivated by recent results of Downarowicz, Snoha and Tywoniuk (J Dyn Differ Equ, 29243-257, 2017) on spaces with cyclic group of homeomorphisms generated by a minimal homeomorphism, and results of the first author, Clark and Oprocha (Adv Math, 335261-275, 2018) on spaces in which the square of every homeomorphism is a power of the same minimal homeomorphism. We show that the two classes do n