Author: Urs Format: MarkdownItexadded some formatting and adjusted the wording here and there
<a href="https://ncatlab.org/nlab/revision/diff/Hopfian+group/7">diff</a>, <a href="https://ncatlab.org/nlab/revision/Hopfian+group/7">v7</a>, <a href="https://ncatlab.org/nlab/show/Hopfian+group">current</a>
added some formatting and adjusted the wording here and there