最近在网上找到许多有趣的文章和lecture notes,因为接近期末周没时间仔细读完,故放置在此。

代数拓扑碎碎念(一):从映射度说起

谱序列:

Clover May Math 237 Spectral Sequences - Spring 2020 at UCLA

Algebraic Topology 2

书:A User’s Guide to Spectral Sequences

A User’s Guide to Spectral Sequences

肖梁 代数学

2023 秋: 代数学 (实验班)

HOMOLOGICAL ALGEBRA - LECTURE NOTES

Daniel Dugger

Daniel Dugger

NOTES ON THE MILNOR CONJECTURES

Mike Hill

Mike Hill

Computational Methods in Algebraic Topology


如何证明莫比乌斯带的边界圆不是形变收缩核? - Eric的回答 - 知乎 https://www.zhihu.com/question/5265920881/answer/75695841029


O. Randal-Williams Algebraic Topology Notes

有许多计算的例子

https://dec41.user.srcf.net/notes/III_M/algebraic_topology_iii_trim.pdf

以上是Dexter Chua做的笔记,他的笔记主页:https://dec41.user.srcf.net/notes/

共几千页.


Shintaro Fushida-Hardy

Homology 3-spheres

https://stanford.edu/~sfh/homosphere.pdf

Grad school application advice

https://stanford.edu/~sfh/advice.pdf


An Infinitely Large Napkin

https://venhance.github.io/napkin/Napkin.pdf

从基础知识到代数数论、代数拓扑、代数几何,很全.


When are finite-index subgroups of a Lie group closed?

https://math.stackexchange.com/questions/454320/when-are-finite-index-subgroups-of-a-lie-group-closed


Marc Lackenby

https://people.maths.ox.ac.uk/lackenby/

有许多关于几何拓扑的研究,发过很多四大

后面想看一些他的讲义,比如 https://people.maths.ox.ac.uk/lackenby/tg11o17.pdf


Lars Hesselholt

https://web.math.ku.dk/~larsh/

比较喜欢他的表示论讲义,打算后面看看.

表示论讲义:https://web.math.ku.dk/~larsh/teaching/S2023_A/representations.pdf

表示论主页:https://web.math.ku.dk/~larsh/teaching/S2023_A/

Topics in Algebraic Topology: https://web.math.ku.dk/~larsh/teaching/F2023/ 后面也可以看看,或者讨论班讲


https://naprienko.com/


Sophus Lie: A Real Giant in Mathematics

https://intlpress.com/site/pub/files/_fulltext/journals/iccm/2015/0003/0001/ICCM-2015-0003-0001-a009.pdf

季李真的文章,挺有意思的


https://www.zhihu.com/question/55626398/answer/521920422

N-1维球面上恰有ρ(N) − 1个逐点线性无关切向量场.

把$N$写作$N=A\cdot 2^B$,其中$A$为奇数,$B$为自然数,$B$又写作$B=c+4d,0\leqslant c<4$,则$\rho(N)=2^c+8d$.


群论里一直想搞的几个问题:

SL₂(𝔽₃) 的 Sylow 子群 (2025中科大考研复试题)

用群作用计数 |GL_n(F_p)|, |SL_n(F_p)| 和 |PSL_n(F_p)|

https://www.zhihu.com/question/1889066006799966287


Daniel Bump 的表示论课程

Math 122: Modules and Group Representation Theory

http://sporadic.stanford.edu/Math122/lecture19.pdf

关于半直积的讲解(有用):http://sporadic.stanford.edu/bump/group/gind1_3.html


A Note on Complex Representations of GL(2, Fq)

https://math.ntnu.edu.tw/~li/note/REPGL2K.pdf


https://subwiki.org/

比较全的数学 wiki

第一次用到是在找 Bruhat 分解

https://groupprops.subwiki.org/wiki/Bruhat_decomposition_for_general_linear_group_of_degree_two_over_a_field


陈小伍 - 中科大

http://home.ustc.edu.cn/~xwchen/

想学代数荣誉课程:http://home.ustc.edu.cn/~xwchen/ModernAlgebra.htm


刘毅 - BICMR

http://scholar.pku.edu.cn/liuyi

有很多想学的课 http://scholar.pku.edu.cn/liuyi/classes

2023年秋季-微分流形与拓扑(实验班):http://scholar.pku.edu.cn/liuyi/fall_2023_course_00137914

2025年春季-几何学II(实验班):http://scholar.pku.edu.cn/liuyi/spring_2025_course_00132382

2024年秋季-微分流形与拓扑(实验班):http://scholar.pku.edu.cn/liuyi/spring_2025_course_00132382

2024年春季-同调论(强化班):http://scholar.pku.edu.cn/liuyi/spring_2024_course_e16x

作业习题值得做一做!!!