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Jan 18, 2021 at 3:08 answer added Todd Trimble timeline score: 4
Jun 15, 2020 at 9:48 answer added Ivan Meir timeline score: 3
Jun 15, 2020 at 2:41 comment added Todd Trimble It's not particularly natural, but I'm thinking the set of irrational numbers whose continued fraction expansion $[a_0; a_1, a_2, \ldots]$ is such that $[a_0; a_2, a_4, \ldots]$ is quadratic irrational should be an example.
Jun 14, 2020 at 20:54 history asked D.S. Lipham CC BY-SA 4.0