https://en.wikipedia.org/wiki/Simplex_category Thinnings are also the morphisms in the simplex category. Simplicial sets are a way of organizing face-edge that use this category as an indexing structure. Is it surprising that de Bruijn manipulations and describing shapes could share this structure? Maybe. Simplicial sets add in degenerate triangles (like a triangle with only 2 distinct vertices (kind of a “thick” line) or even only 1 distinct vertex (a “thick” point)). These are added in because it makes things cleaner. This degenerayc and tossing stuff away does kind of jive with thinning. Nameless Projections kind of jive with thinning. I dunno. If a triangle is a list of 3 points, the oriented edges are kind of the 2 vertex sublists of that and the vertices are kind of the 1 vertex sublists.
2025年12月1日，由国家市场监督管理总局、工业和信息化部联合修订的《电动自行车安全技术规范》（GB 17761-2024）（即“新国标”）过渡期正式结束，旧国标电动车全面禁售。新国标再次明确：电动自行车最高设计车速不得超过25公里/小时，一旦超过，电机将停止提供动力输出。
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in a series of papers, including the
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