Author: Thomas Holder Format: MarkdownItexAdded a reference.
<a href="https://ncatlab.org/nlab/revision/diff/mereology/7">diff</a>, <a href="https://ncatlab.org/nlab/revision/mereology/7">v7</a>, <a href="https://ncatlab.org/nlab/show/mereology">current</a>