writing on dimensionality

Because of work Bedell did (on a Sunday!) in support of the Milky Way Mapper meeting, I got renewed excitement about our element-abundance-space dimensionality and diversity work: She was able to show that we can see aspects of the low dimensionality of the space in the spectra themselves, mirroring work done by Price-Jones (Toronto) in APOGEE, but with more specificity about the abundance origins of the dimensionality. That got me writing text in a document. As my loyal reader knows, I am a strong believer in writing text during (not after) the data-analysis phases. I'm also interested in looking at information-theoretic or prediction or measurement approaches to dimensionality.

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