https://nan2inf.cn/个人写作、研究笔记、数学、算法、项目和小工具。zh-CNMon, 01 Jun 2026 00:00:00 GMThttps://nan2inf.cn/math/abstract-algebra-course-map/https://nan2inf.cn/math/abstract-algebra-course-map/从 .com 课程树生成的目录型迁移样例，用于检验个人站是否需要系列/专题结构。Mon, 01 Jun 2026 00:00:00 GMT数学mathabstract-algebracourse-mapdirectorymigrationhttps://nan2inf.cn/math/group-action-orbit-stabilizer/https://nan2inf.cn/math/group-action-orbit-stabilizer/从 .com 抽象代数笔记迁入，覆盖群作用、轨道、稳定子、类方程与 Burnside 引理。Mon, 01 Jun 2026 00:00:00 GMT数学mathabstract-algebragroup-actionmigrationhttps://nan2inf.cn/math/first-order-characteristics/https://nan2inf.cn/math/first-order-characteristics/从 .com 迁移的一阶线性方程笔记，用于验证真实旧文的短代码和公式渲染。Mon, 01 Jun 2026 00:00:00 GMT数学mathpdemigrationhttps://nan2inf.cn/math/hahn-banach-theorem/https://nan2inf.cn/math/hahn-banach-theorem/从 .com 迁移的泛函分析笔记，覆盖多段公式、证明结构和旧式强调写法。Mon, 01 Jun 2026 00:00:00 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