Author: mattecapu Format: MarkdownItexJoin of categories as a cocomma
<a href="https://ncatlab.org/nlab/revision/diff/join+of+categories/11">diff</a>, <a href="https://ncatlab.org/nlab/revision/join+of+categories/11">v11</a>, <a href="https://ncatlab.org/nlab/show/join+of+categories">current</a>