Author: Urs Format: MarkdownItexFor textbook or other extensive references it's good to say where in the text one wants the reader to have a look. Here it's "Def. 11.2.1", I have added that in.
<a href="https://ncatlab.org/nlab/revision/diff/identity+system/3">diff</a>, <a href="https://ncatlab.org/nlab/revision/identity+system/3">v3</a>, <a href="https://ncatlab.org/nlab/show/identity+system">current</a>
For textbook or other extensive references it’s good to say where in the text one wants the reader to have a look. Here it’s “Def. 11.2.1”, I have added that in.