up

xieyuheng · xieyuheng · commit e4c78b23c758 · 2024-07-28T21:20:13.000+08:00
diff --git a/TODO.md b/TODO.md
@@ -1,3 +1,7 @@
+用闭包算子可以定义拓扑空间吗？
+
+- https://en.wikipedia.org/wiki/Characterizations_of_the_category_of_topological_spaces
+
 # lattice layout
 
 练习 order book 中计算 concept lattice 的算法。
