https://wenjinji.cn/en/subjects/%E6%95%B0%E5%AD%A6/Recent content in 数学 on 问衿的学习笔记HugoenSat, 01 Aug 2026 00:00:00 +0000https://wenjinji.cn/en/episodes/hilbert-sixth/Sat, 01 Aug 2026 00:00:00 +0000https://wenjinji.cn/en/episodes/hilbert-sixth/A 49-page paper closes a 125-year-old problem: deriving Navier–Stokes rigorously from Newtonian hard-sphere collisions.https://wenjinji.cn/en/episodes/kakeya-3d/Thu, 30 Jul 2026 00:00:00 +0000https://wenjinji.cn/en/episodes/kakeya-3d/A 127-page paper ends the 108-year Kakeya problem: any 3D set holding a unit needle in every direction must have full dimension 3.