Author: Urs Format: MarkdownItexbrushed-up the references and added pointer to discussion via fundamental groups of cell complexes.
<a href="https://ncatlab.org/nlab/revision/diff/group+presentation/21">diff</a>, <a href="https://ncatlab.org/nlab/revision/group+presentation/21">v21</a>, <a href="https://ncatlab.org/nlab/show/group+presentation">current</a>
brushed-up the references and added pointer to discussion via fundamental groups of cell complexes.