Topology space Aug 3, 2018 Mathematics This is my first blog. čæęÆęēē¬¬äøēÆå客ć Definition of topology space https://www.youtube.com/watch?v=fRnjES8bE_o https://www.youtube.com/watch?v=AmgkSdhK4K8 https://zhuanlan.zhihu.com/p/28719868 https://zhuanlan.zhihu.com/p/28700133 Please enable JavaScript to view the comments powered by Disqus.