Author: valeriadepaiva Format: MarkdownItexthe link was not working
<a href="https://ncatlab.org/nlab/revision/diff/Brian+Day/11">diff</a>, <a href="https://ncatlab.org/nlab/revision/Brian+Day/11">v11</a>, <a href="https://ncatlab.org/nlab/show/Brian+Day">current</a>