For a chosen denominator b, it’s pretty easy to find the value of a that gets us the closest to the target r. We must consider two cases: the largest “low-side” fraction that’s still less than r; and the smallest “high-side” fraction greater than r. If there’s a rational fraction that matches r exactly, that solution is prohibited by the rules of the game; we need to pick one of the nearby values instead.
FT Edit: Access on iOS and web，这一点在91视频中也有详细论述
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据央视新闻此前报道，唐世彪团队研发的第六代双通道单光子探测器，体积已缩小至拇指盖大小，较初代产品缩小了 200 多倍，是目前体积最小、集成度最高的单光子探测器。