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Dec 2, 2019 at 3:14 history edited Josiah Park CC BY-SA 4.0
deleted 2 characters in body
Dec 2, 2019 at 3:09 history edited Josiah Park CC BY-SA 4.0
removed repeated 'often'
Dec 28, 2018 at 19:57 vote accept Breakfastisready
Jul 6, 2023 at 12:31
Dec 27, 2018 at 5:11 comment added Josiah Park @Breakfastisready Yes, essentially this is what is being suggested. This tool and the fact that the function $\beta(x)$ has the desired property of switching signs at $x=a$ seem to be ample motivation for choosing the above function.
Dec 27, 2018 at 5:04 comment added Breakfastisready So the overall reason is that they saw the Chrisotoffel-Darboux expressions and had a clever inspiration? Maybe it's really just that. Let's see if someone has a better answer.
Dec 27, 2018 at 4:36 history answered Josiah Park CC BY-SA 4.0