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    Spectral libraries and their uncertainties

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    Libraries of stellar spectra are fundamental tools in the study of stellar populations and in automatic determination of atmospheric parameters for large samples of observed stars. In the context of the present volume, here I give an overview of the current status of stellar spectral libraries from the perspective of stellar population modeling: what we have currently available, how good they are, and where we need further improvement

    Towards a statement of the S-adic conjecture through examples

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    The SS-adic conjecture claims that there exists a condition CC such that a sequence has a sub-linear complexity if and only if it is an SS-adic sequence satisfying Condition CC for some finite set SS of morphisms. We present an overview of the factor complexity of SS-adic sequences and we give some examples that either illustrate some interesting properties or that are counter-examples to what could be believed to be "a good Condition CC".Comment: 2
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