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Jan 5, 2022 at 16:49 comment added Oscar Cunningham The inequality could be phrased as $(D^na)_0\geq 0$, where $D$ is the difference operator.
Nov 18, 2019 at 18:28 comment added Gerhard Paseman This looks related to free spectra (b_n is the number of elements of the free algebra generated by n elements in a locally finite variety in universal algebra). If so, there is a lot of work classifying such sequences and saying what properties the theory (or models of the theory) must have. Gerhard "Interested In Some Spectrum Problems" Paseman, 2019.11.18.
Nov 18, 2019 at 17:42 history edited Valery Isaev CC BY-SA 4.0
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Nov 18, 2019 at 17:04 history edited Valery Isaev CC BY-SA 4.0
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Nov 18, 2019 at 16:40 history answered Valery Isaev CC BY-SA 4.0