Kerodon

$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$

Question 1.0.0.2. Let $X$ be a topological space. To what extent does the simplicial set $\operatorname{Sing}_{\bullet }(X)$ behave like a category? What is the relationship between $\operatorname{Sing}_{\bullet }(X)$ with the fundamental groupoid of $X$?