Author: perezl.alonso Format: MarkdownItexadded few words on classification
<a href="https://ncatlab.org/nlab/revision/diff/discrete+torsion/18">diff</a>, <a href="https://ncatlab.org/nlab/revision/discrete+torsion/18">v18</a>, <a href="https://ncatlab.org/nlab/show/discrete+torsion">current</a>