Author: Urs Format: MarkdownItexa stub entry --- for the moment just to make the link work
<a href="https://ncatlab.org/nlab/revision/Lusternik-Schnirelmann+category/1">v1</a>, <a href="https://ncatlab.org/nlab/show/Lusternik-Schnirelmann+category">current</a>
a stub entry — for the moment just to make the link work