Author: DavidRoberts Format: MarkdownItexAdded minor clarification around the acronym NDR, and specified that an NDR pair gives a _closed_ Hurewicz cofibration
<a href="https://ncatlab.org/nlab/revision/diff/neighborhood+retract/11">diff</a>, <a href="https://ncatlab.org/nlab/revision/neighborhood+retract/11">v11</a>, <a href="https://ncatlab.org/nlab/show/neighborhood+retract">current</a>
Added minor clarification around the acronym NDR, and specified that an NDR pair gives a closed Hurewicz cofibration